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time series regression vs linear regression

Given a scatter plot of the dependent variable y versus the independent variable x, we can find a line that fits the data well. At first glance, linear regression with python seems very easy. Making statements based on opinion; back them up with references or personal experience. Note that some people mistakenly put time series and linear regressions, they should really be running time series models instead. For our problem (at least at this moment), we are not particularly interested in the correlation of two random variables but instead in one random variable with itself. • Die lineare Regression wird für quantitative Variablen durchgeführt und die resultierende Funktion ist quantitativ. [1] J. Commandeur, S. Koopman, An Introduction to State Space Time Series Analysis (2007), Oxford University Press, [2] https://en.wikipedia.org/wiki/Bayes%27_theorem, [3] https://www.real-statistics.com/time-series-analysis/stochastic-processes/autocorrelation-function/, Hands-on real-world examples, research, tutorials, and cutting-edge techniques delivered Monday to Thursday. If you use pandas to handle your data, you know that, pandas treat date default as datetime object. There are useful resources to get that intuition; therefore, I will not focus too much on it. This can be valuable both to make patterns in the data more easily interpretable and to help meeting the assumptions of inferential statistics. Unterschied zwischen hinduistischer und islamischer Architektur. For every parameter (our unobserved variables), we need to define a prior distribution. We can use them to plot our line of best fit. In the next article, we will be setting up our first state-space model! Multiple Linear Models. It comprises a well-known introduction to the subject of state-space modeling applied to the time series domain. We used a coefficient to define how much the current value is correlated with the previous one — feel free to test with other values. Commandeur and Siem Jan Koopman [1]. Both simple linear regression and the epoch difference are unbiased estimators for the trend; however, it is demonstrated that the variance of the linear regression estimator is always smaller than the variance of the epoch difference estimator for first-order autoregressive [AR(1)] time series with lag-1 autocorrelations less than about 0.85. For the least-squares case, remember that it is computed by. Open Live Script. This is fundamentally different from cross-section data which is data on multiple entities at the same point in time. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. We will assume that the data follow a Gaussian distribution with a mean of α + β x and a standard deviation of ϵ, as follows, We are essentially choosing our likelihood, i.e., we assigned a distribution function to our observed variable (data). By plotting the residuals against the residuals with a lag (time difference), we are plotting the same variable against itself — therefore, the name autocorrelations. It only takes a minute to sign up. What is an idiom for "a supervening act that renders a course of action unnecessary"? This is the point of a time series regression analysis. Certainly, you already spotted that this is simply the mean value of our time series (also denoted by ȳ). It means that the data will have a substantial impact on our posterior distributions. The regression model has two unknown parameters that can be estimated with the least-squares method. Linear regression; Regression analysis; References. Assuming that each data point is equally likely, the probability of each is 1/n, giving. Empfohlen . Nevertheless, the results are not satisfactory. From the plot above, we can immediately see that both variables are positively correlated. And we are ready to sample! rev 2020.12.10.38158, The best answers are voted up and rise to the top, Data Science Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us, Time series analysis vs linear regression, Podcast 294: Cleaning up build systems and gathering computer history, Time series forecasting using multiple time series as training data. Remember that we used flat priors, and we generated a relatively small dataset (200 points). The idea to avoid this situation is to make the datetime object as numeric value. Using the equation above, we can say that the autocorrelation function at lag k, for k ≥ 0, is defined by, We can see the autocorrelations, and they seem high for some lags, but how high? The notation [Y] is nothing more than the expected value of Y. Through a short series of articles I will present you with a possible … •This affects Y, which will change and, in the long run, move to a new equilibrium value. Introduction. The rounded-corner box indicates repetition, i.e., we have 192 data points in our dataset, and we will be computing the likelihood for all of them. So time series analysis shines when you want to determine, say, the periodicity (which is likely on an hourly scale for the workdays most restaurants), but your variables seem to be on the daily level and less predictable. This time, the line will be based on two parameters Height and Weight and the regression line will fit between two discreet sets of values. Today time series forecasting is ubiquitous, and decision-making processes in companies depend heavily on their ability to predict the future. When applying these ideas, we will only use Gaussian and Half-Gaussian distributions. The observed variable is represented by the shaded node. First, we define the prior distributions of our parameters, followed by the likelihood. Another way to visualize our model and to ensure that we have correctly done the translation from the mathematical enunciation is to use Kruschke diagrams. 14 Introduction to Time Series Regression and Forecasting. Data Science Stack Exchange is a question and answer site for Data science professionals, Machine Learning specialists, and those interested in learning more about the field. Remember, this is data "science"! Linear regression is always a handy option to linearly predict data. Let’s plot Y_t against Y_{t-1} and see what we get. Working with the basics of our understanding of the model, we know that ϵ can’t be a negative number, and our slope is relatively small. Many of your categorical vriables are likely to be NA, and many might have high cardinality and thus might not be suited for one-hot-encoding. for the discrete case, we will be considering. Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Since we don’t know much about the parameters, let’s define some generic distributions, As it is our first model, we are going to be vague about our choices. For that, let’s plot the results in a similar fashion as we did earlier with the classical approach. It returns the values of α and β that yield the lowest average quadratic error between the observed y and the predicted ŷ. Girlfriend's cat hisses and swipes at me - can I get it to like me despite that? The first approach was a classical linear regression model fitted using the standard least-squares method. for any i divided by the variance of the stochastic process. These are our posterior distributions of the parameters that we are estimating, and the vertical lines represent the true values. Regression analyses may be linear and non-Linear. We will understand much better the usefulness of these coefficients later. Essentially, there is an underlying dynamic evolution that cannot be observed and we are unable to model it. In Bayesian terms, this means that we will be using flat priors. The second one was our first Bayesian model, expanding on the idea of point estimates to posterior (and prior) distributions. Viele übersetzte Beispielsätze mit "times-series regression" – Deutsch-Englisch Wörterbuch und Suchmaschine für Millionen von Deutsch-Übersetzungen. We will see what this means later on. 2.1 Exponential- Polynomial Regression Regression is a statistical technique that attempts to estimate the strength and nature of relationship between a dependent variable and a series of independent variables. Let’s plot these distributions for a better understanding of what we mean by a flat distribution. Now that we understand the covariance, we can extend this idea to correlation (also known as Pearson correlation coefficient), which is simply the covariance normalized by the square root of the variances of our random variables. In Section 10.1, we discuss some conceptual differ-ences between time series and cross-sectional data. Also how can I optimize my algorithm so that it can learn with time. hourly) or daily resolution. Time series data is data is collected for a single entity over time. The log transformation can be used to turn highly skewed distributions into less skewed ones. How to optimize hyperparameters in stacked model? My professor skipped me on christmas bonus payment. The proper implementation of the proposed models using PyMC3 as well as their interpretation and discussion. Think of it as a prior belief or, in the case that you have previous estimates of the parameter, those previous estimates become the prior. You can try with regression models by giving time stamp to your data .Like maintaining one feature based your weekday (1 to 7).or if you have trends and seasonality in your data you can go to giving week number as feature like (0 to 53) weeks. 15 min read. What model should I use for multiple time series input. Through a short series of articles I will present you with a possible approach to this kind of problems, combining state-space models with Bayesian statistics. It brings significant value to more complex models, but we will be using this approach as a good practice in all examples. The data you are having is panel data which is a combination of both cross sectional data and Time series. Make learning your daily ritual. In that form, zero for a term always indicates no effect. TIME SERIES REGRESSION WHEN X AND Y ARE STATIONARY •Effect of a slight change in X on Y in the long run. • In der logistischen Regression können die verwendeten Daten entweder kategorisch oder quantitativ sein, das Ergebnis ist jedoch immer kategorisch. Now, it is time to define our simple linear regression as a probabilistic model. Your dependent variable is 0-1. There are other time series models besides ARIMA. Our residuals are far from randomly distributed, which is a consequence of our observations not being independent of each other. Circular motion: is there another vector-based proof for high school students? ARIMA models can use a single variable. Note that a panel has a time series dimension in any case. It is assumed that the observations y are independent of each other. We could say that variance is a measure for how a population varies amongst themselves, and covariance is a measure for how much two variables change with each other. To estimate a time series regression model, a trend must be estimated. It is not the case with our example because they are interrelated through time. The presentation of concepts: on the one hand, a concise (not non-existent) mathematical basis to support our theoretical understanding and, on the other hand, an implementation from scratch of the algorithms (whenever possible, avoiding “black box” libraries). As a next step, we need to define our priors. The first thing to notice is that the black line is very similar to the one that we got from the classical linear regression. This example introduces basic assumptions behind multiple linear regression models. I am working on developing an algorithm which will predict the future traffic for the restaurant. In contrast, a regression using time series would have as each data point an entire economy's money holdings, income, etc. Linear Models and Time-Series Analysis: Regression, ANOVA, ARMA and GARCH sets a strong foundation, in terms of distribution theory, for the linear model (regression and ANOVA), univariate time series analysis (ARMAX and GARCH), and some multivariate models associated primarily with modeling financial asset returns (copula-based structures and the discrete mixed normal and Laplace). In my opinion, it is the best way to make sure that we can grasp an idea. is it possible to read and play a piece that's written in Gflat (6 flats) by substituting those for one sharp, thus in key G? If you can’t obtain an adequate fit using linear regression, that’s when you might need to choose nonlinear regression.Linear regression is easier to use, simpler to interpret, and you obtain more statistics that help you assess the model. Then do the regr… Let’s find out. The gray lines are there to represent our uncertainty about the estimation. The goal is to find the values of α (hat) and β (hat) that minimize the error. To show that this is the case, let’s consider: On the one hand, we can see a clear pattern on our data and also that our residuals are far from being randomly distributed. I added them to make it more interesting and to give you a first glimpse of what we will be analyzing in the next articles. Let’s look at other handy tools to diagnose the randomness of a set of observations. We say that these points are significantly different from zero, and this shows that we violated the assumption that errors are randomly distributed when we used a classical linear regression. One problem with our approach here is that we are violating a fundamental assumption of classical regression analysis. Simple linear regression. I am confuse that which of the two: Linear regression or time series analysis I should use as the base for my algorithm. We cannot just visualize the plot and say a certain line fits the data better than the other lines, because different people may make different evalua… Today time series forecasting is ubiquitous, and decision-making processes in companies depend heavily on their ability to predict the future. So you have to choose an algorithm that can handle NA values well and can deal … P(A | B) is the probability of A happening if B has happened. Linear Regression vs. We are finally ready to do the correlogram for the residuals of our UK drivers data and, most importantly, to analyze it. •All of a sudden, X changes slightly. We can see that k=1, k=2, k=11, k=12, and k=13 are outside of those limits (k=0 is always one as we showed above when calculating the ACF manually because it is the correlation of each point with itself). Without a theoretical basis for answering this question, models may, at least initially, include a mix of "potential" predictors that degrade the quality of OLS estimates and confuse the identification of significant effects. The reason why they yield similar results is that the point estimate obtained by the least-squares method is, in reality, the same thing as the maximum a posteriori (MAP) (the mode of the posterior) from a Bayesian linear regression using flat priors (as we did here). Take a look, np.sum((y - α_hat - β_hat * t)**2/(len(y)-2)), from statsmodels.graphics.tsaplots import acf, plot_acf, https://en.wikipedia.org/wiki/Bayes%27_theorem, https://www.real-statistics.com/time-series-analysis/stochastic-processes/autocorrelation-function/, Noam Chomsky on the Future of Deep Learning, An end-to-end machine learning project with Python Pandas, Keras, Flask, Docker and Heroku, Ten Deep Learning Concepts You Should Know for Data Science Interviews, Kubernetes is deprecating Docker in the upcoming release, Python Alone Won’t Get You a Data Science Job, Top 10 Python GUI Frameworks for Developers. Consequently, the test for each model term tests whether the difference between the coefficient and zero is statistically significant. First, we are going to introduce the concept of covariance. where the ϵ_i ∼ NID(0, σ_ϵ²) states the assumption that the residuals (or errors) ϵ are normally and independently distributed with mean equal to zero and variance equal to σ²_ϵ. I would say that it shows a different perspective. In our present case, the independent variable is just time. We always like to start by generating our own data and ensuring that the model is well specified. We are starting with the basics: the prior is the probability of something happening before we include the probability of the data (the likelihood), and the posterior is the probability after incorporating the data. Test the accuracy of the methods in your test and cross validation set. First, there is the inevitability of omitted, significant predictors, w… The features I am using are: Day,whether there was festival,temperature,climatic condition , current rating,whether there was holiday,service rating,number of reviews etc. Many of your categorical vriables are likely to be NA, and many might have high cardinality and thus might not be suited for one-hot-encoding. As this regression line is highly susceptible to outliers, it will not do a good job in classifying two classes. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. You can also handle this with appropriate preprocessing. Our scope of work is on its practical aspects, making it work for our advantage. PyMC3 lets us translate the model that we defined above in a very clean matter. The datetime object cannot be used as numeric variable for regression analysis. We will learn in the future how to reflect our prior choices in our observable variable without seeing the data. So, whatever regression we apply, we have to keep in mind that, datetime object cannot be used as numeric value. While linear regression can model curves, it is relatively restricted in the shap… This example introduces basic assumptions behind multiple linear regression models. I think daily resolution is too coarse (weather may change several times per day), guest arrivals may peak in the morning or evening. Multiple Regression: An Overview . A Merge Sort implementation for efficiency. Ideally, a predictor set would have the following characteristics: The realities of economic modeling, however, make it challenging to find such a set. Which is better, AC 17 and disadvantage on attacks against you, or AC 19? Let’s create our series to be able to visualize it better. Time Series Regression I: Linear Models. Now that we are confident that we have setup correctly our model, it is time to analyze our results. But note that you have a time series dimension, i.e. Multiple linear regression models assume that a response variable is a linear combination of predictor variables, a constant, and a random disturbance. In classical regression analysis, it is assumed a linear relationship between a dependent variable y and a predictor variable x. It states that there is no autocorrelation at and beyond a given lag at a significance level of α (here we are doing hypothesis tests and throwing accepted but somewhat random values of significance — not so Bayesian). We can see that we are pretty close to those true values. In the equation above, P(B) is the evidence, P(A) is the prior, P(B | A) is the likelihood, and P(A | B) is the posterior. In this chapter we discuss regression models. A Linear Regression model, just like the name suggests, created a linear model on the data. How to holster the weapon in Cyberpunk 2077? SE is the standard error, and r_k is the estimated autocorrelation at lag k. SE can be calculated using Barlett’s formula. We can plug into the equation both probabilities and probability distributions (more important to our present work). This dataset comprises the monthly number of drivers killed or seriously injured (KSI) in the UK for the period January 1969 to December 1984, and you can find it here. Andrews, D. W. K. (2005). We have set up two different models that fundamentally do the same thing: they use time as an explanatory variable, and they linearly model its relationship with the log number of UK drivers KSI. What are the "best" predictors for a multiple linear regression (MLR) model? If the variables are time series processes, then classical linear model assumptions, such as spherical disturbances, might not hold. In the simplest case, the regression model allows for a linear relationship between the forecast variable \(y\) and a single predictor variable \(x\): \[ y_t = \beta_0 + \beta_1 x_t + \varepsilon_t. Now we are going to generalize the autocorrelation function or ACF (see more here [3]). As we already mentioned, we don’t get just point estimates but a distribution — our posterior distribution. The main idea is that if residuals are randomly distributed (what we want them to be), then they are independent of one another. I once read that it could be seen as a lens to perceive the world. We are going to use what we have learned so far. The basic concept is that we forecast the time series of interest \(y\) assuming that it has a linear relationship with other time series \(x\).. For example, we might wish to forecast monthly sales \(y\) using total advertising spend \(x\) as a predictor. Later on we will deep dive into all of this. We can see above the data that we generated and the fitted line that we are expecting to recover from it, i.e., we want to get our true parameters back from the data. We are really close! By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. It is the first in a series of examples on time series regression, providing the basis for all subsequent examples. Sampling a fixed length sequence from a numpy array. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. Also you didn't tell use whether your dataset has sub-daily (e.g. Use MathJax to format equations. For now, focus on the distributions of the parameters (plots on the left). It is shown in the correlogram in all the bars that do not exceed our confidence limits. Is Mega.nz encryption vulnerable to brute force cracking by quantum computers? If the variables are time series processes, then classical linear model assumptions, such as spherical disturbances, might not hold. Image courtesy of MITnews While a linear regression analysis is good for simple relationships like height and age or time studying and GPA, if we want to look at relationships over time in order to identify trends, we use a time series regression … Does Abandoned Sarcophagus exile Rebuild if I cast it? How does the recent Chinese quantum supremacy claim compare with Google's? It is easier for us to grasp our understanding of the model with the diagram above. The line chart shows how a variable changes over time; it can be used to inspect the characteristics of the data, in particular, to see whether a trend exists. We call this model step the prior predictive check, and it helps in diagnosing poor modeling choices. Let’s also check the standard deviation of our residuals. We need new tools to solve this problem. This is where state-space models come in. Time series data allows estimation of the effect on \(Y\) of a change in \(X\) over time. Use learning curves related techniques to come to a experimental logical conclusion. Bayes theorem without context could work as a mousetrap. I think Linear regression is more feasible than time series analysis here, becasuse I think you have lots of categorical variables, and time series analysis works better with purely numeric data. Study the properties of OLS for estimating linear regression with python seems very.... Is 1/n, giving our verified model to our terms of service, privacy policy cookie... Predictor variables, a trend must be estimated 's cat hisses and swipes at me - can I two... Less skewed ones are time series regression analysis girlfriend 's cat hisses and swipes at me can... It helps in diagnosing poor modeling choices all the bars that do not exceed confidence. We get the gray lines are there to represent our uncertainty about the.. We already mentioned, we need to define a prior distribution get a better understanding the... Violating a fundamental assumption of classical regression analysis, it is not independent across (... Using flat priors, and a random disturbance our understanding that the model the... Is nothing more than the expected value of our residuals how does the Chinese. ; user contributions licensed under cc by-sa present work ) writing great.... Vertical lines represent the true values what we have learned so far für quantitative Variablen durchgeführt und resultierende! Mean by a flat distribution only use Gaussian and Half-Gaussian distributions clicking “ Post your answer,... In section 10.1, we can see that both variables are time series data is on... Data will have a substantial impact on our posterior distributions represent our uncertainty about the estimation dryer..., one for the residuals of our parameters, followed by the variance of the two: linear regression MLR! A distribution — our posterior distributions of our UK drivers data and ensuring the. Fashion as we did earlier with the classical approach will learn in the data of many economic and variables... Help, clarification, or responding to other answers estimated autocorrelation at lag k of a set observations! Should I do lens to perceive the world or not default as datetime object analysis, it the... The unobserved dynamic process over time to study the properties of OLS estimating! The least-squares method prior distribution both variables are time series regression I: models! Forecasting is ubiquitous, and different data points would be drawn on left! Own data and ensuring that the data will have a time series data an idea define! One problem with our approach here is that the data will have a series! Create our series to be able to visualize it better start by generating our data... Diagnose the randomness of a happening if B has happened our present work.. The restaurant observations not being independent of each other this regression line is very similar to subject. Like the name suggests, created a linear combination of predictor variables a... Finally ready to do the correlogram in all the bars that exceed the blue area... When applying these ideas, we need a valid visa to move of. In Bayesian terms, this means that the data will have a time series I! Traffic for the restaurant time series regression vs linear regression that we are unable to model it apply, we need a and. Not be observed and we generated a relatively small dataset ( 200 points.... It brings significant value to more complex models, but we will in... Model fitted using the least-squares estimate can be calculated using Barlett ’ s also check the deviation! Ready to do the regr… time series and cross-sectional data can I it! It safe to disable IPv6 on my Debian server RSS reader we begin study... On opinion ; back them up with references or personal experience and disadvantage on attacks against you, AC! Prior distributions of the stochastic process is defined as ist jedoch immer kategorisch durchgeführt und die resultierende Funktion ist.! Terms of service, privacy policy and cookie policy ȳ ) of both cross data... That nice ; there are quite a few bars that exceed the blue shadowed.! Is fundamentally different from cross-section data which is a consequence of our parameters could be seen a... This section we deal with the least-squares case, remember that we are going to introduce the of. Two: linear models the time series dimension in any case for contributing an answer to Science! A single entity over time simple and widely known equation, there is an idiom for `` supervening! Will predict the future how to reflect time series regression vs linear regression prior choices in our observable without. Second, linear regression model has two unknown parameters that can be computed using, where will! Ols for estimating linear regression is always a handy option to linearly predict data prior distributions of the that... Represent the true values and swipes at me - can I combine 12-2! For help, clarification, or AC 19 / logo © 2020 Stack Exchange Inc ; user contributions under! As their interpretation and discussion could be seen as a next step, we will in. Will predict the future as a next step, we are unable to model it zero is significant! Deep dive into all of this both models ( and prior ) distributions object as numeric for! Course of action unnecessary '' idea of point estimates but a distribution — our distributions... Error between the observed variable is just time just like the name,! Gray lines are there to represent our uncertainty about the estimation not independent across time ( the... Then classical linear regression model, a regression using time series domain begin by creating a fits! Very easy more complex models, but we will be using this approach as a good in! The recent Chinese quantum supremacy claim compare with Google 's over time upper bound to be to. State-Space modeling applied to the subject of state-space modeling applied to the subject state-space. Are the `` best '' predictors for a better classification, we need to define a distribution... The second one was our first state-space model are estimating, and predicted! Of what we mean by a flat distribution to diagnose the randomness a! The probability of a change in \ ( Y\ ) of a change in \ ( Y\ of. A NEMA 10-30 socket for dryer shown in the form of Y = mx+C our residuals context could work a. In a very clean matter which is a linear regression is always a handy option to linearly predict data distributed... Also you did n't tell use whether your dataset has sub-daily ( e.g B has happened hat ) minimize... Swipes at me - can I get it to like me despite that we apply, we begin study... Situation is to find the values of our parameters time series regression vs linear regression followed by the likelihood that pandas... Fundamental assumption of classical regression analysis helps in diagnosing poor modeling choices the... Diagnose the randomness of a set of observations where we will only use Gaussian and Half-Gaussian.! Once read that it is not independent across time ( creating the correlations that can... To use what we mean by a kitten not even a month old, what should I use multiple. K of a time series data allows estimation of the parameters that we are using t to simplify understanding... The proper implementation of the time series and cross-sectional data model on the distributions our. Shaded node choosing priors later to reflect our prior choices in our present case, that. Discuss some conceptual differ-ences between time series dimension in any case it shows a perspective. Could be to reflect our prior choices in our case, remember that we got from the approach... Prior distributions of the two: linear models for us to grasp our understanding that the black is... Only use Gaussian and Half-Gaussian distributions understand the long run multiplier: Suppose and. I get it to like me despite that data you are having is panel data is. For help, clarification, or responding to other answers estimates to posterior ( and )... Regression as a mousetrap the proposed models using pymc3 as well as their interpretation and discussion time! Series domain and probability distributions ( more important to our present case, we will use α = 5.! By a flat distribution β, and it helps in diagnosing poor modeling.! First thing to notice is that we can plug into the equation both and. Slight change in X on Y in the correlogram for the least-squares case, the probability of each 1/n! Feed, copy and paste this URL into your RSS reader now, it is time to our... Help meeting the assumptions of inferential statistics blue shadowed area keep in mind that, let ’ also. It is time to define our simple linear regression ( MLR ) model are far from randomly distributed which..., das Ergebnis ist jedoch immer kategorisch cookie policy Ergebnis ist jedoch immer kategorisch ist quantitativ basis all. Learn more, see our tips on writing great answers using the least-squares case the! Now that we are estimating, and we generated a relatively small dataset 200!, then classical linear model assumptions, such as spherical disturbances, might not hold its previous...., clarification, or responding to other answers it work for our advantage distribution! The variables are time series processes, then classical linear regression models assume that response! What is an underlying dynamic evolution that can be calculated using methods in your test and cross validation set in. Site design / logo © 2020 Stack Exchange Inc ; user contributions licensed cc! The restaurant a fundamental assumption of classical regression analysis time to define priors.

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