{"id":201996,"date":"2024-02-07T11:46:31","date_gmt":"2024-02-07T16:46:31","guid":{"rendered":"https:\/\/ibkrcampus.com\/?p=201996"},"modified":"2024-02-07T11:46:49","modified_gmt":"2024-02-07T16:46:49","slug":"autoregression-time-series-models-trading-python-and-more-part-i","status":"publish","type":"post","link":"https:\/\/www.interactivebrokers.com\/campus\/ibkr-quant-news\/autoregression-time-series-models-trading-python-and-more-part-i\/","title":{"rendered":"Autoregression: Time Series, Models, Trading, Python and More &#8211; Part I"},"content":{"rendered":"\n<p>Author: Chainika Thakar (Originally written by Satyapriya Chaudhari)<\/p>\n\n\n\n<p>Autoregression emerges as a powerful tool for anticipating future values in time-based data. This data, known as a time series, consists of observations collected at various timestamps, spaced either regularly or irregularly. Leveraging historical trends, patterns, and other hidden influences, autoregression models unlock the capability to forecast the value for the next time step.<\/p>\n\n\n\n<p>By analysing and learning from past data, these models (including various options beyond autoregression) paint a picture of future outcomes. This article delves deeper into one particular type: the autoregression model, often abbreviated as the AR model.<\/p>\n\n\n\n<p>This article covers:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>What is autoregression?<\/li>\n\n\n\n<li>Formula of autoregression<\/li>\n\n\n\n<li>Autoregression calculation<\/li>\n\n\n\n<li>Autoregression model<\/li>\n\n\n\n<li>Autoregression vs autocorrelation<\/li>\n\n\n\n<li>Autoregression vs linear regression<\/li>\n\n\n\n<li>Autoregression vs spatial autoregression<\/li>\n\n\n\n<li>Autocorrelation Function and Partial Autocorrelation Function<\/li>\n\n\n\n<li>Steps to build an autoregressive model<\/li>\n\n\n\n<li>Example of autoregressive model in Python for trading<\/li>\n\n\n\n<li>Applications of autoregression model in trading<\/li>\n\n\n\n<li>Common challenges of autoregression models<\/li>\n\n\n\n<li>Tips for optimizing autoregressive model performance<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"what-is-autoregression\">What is autoregression?<\/h2>\n\n\n\n<p>Autoregression models&nbsp;<a href=\"https:\/\/blog.quantinsti.com\/time-series-analysis\/\">time-series<\/a>&nbsp;data as a linear function of its past values. It assumes that the value of a variable today is a weighted sum of its previous values.<\/p>\n\n\n\n<p>For example, analysing the past one month\u2019s performance of AAPL (APPLE) to predict future performance.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"formula-of-autoregression\">Formula of autoregression<\/h3>\n\n\n\n<p>In simpler terms, autoregression says: &#8220;<em>Today&#8217;s value depends on yesterday&#8217;s value, the day before that, and so on.<\/em>&#8220;<\/p>\n\n\n\n<p>We express this relationship mathematically using a formula:<\/p>\n\n\n\n<p class=\"has-text-align-center\">X <sub>t<\/sub> = c + \u03c6<sub>1<\/sub>X<sub>t<\/sub> \u2212 <sub>1<\/sub> + \u03c6<sub>2<\/sub>X<sub>t<\/sub> \u2212 <sub>2<\/sub> + &#8230; + \u03c6<sub>p<\/sub>X<sub>t<\/sub> \u2212 <sub>p<\/sub> + \u03b5<sub>t<\/sub><\/p>\n\n\n\n<p>Where,<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>X<sub>t<\/sub> is the current value in the timeseries.<\/li>\n\n\n\n<li>c is a constant or intercept term.<\/li>\n\n\n\n<li>\u03d5<sub>1<\/sub>,\u03d5<sub>2<\/sub>,\u2026,\u03d5<sub>p<\/sub> are the autoregressive coefficients.<\/li>\n\n\n\n<li>X<sub>t<\/sub>\u2212<sub>1<\/sub>,X<sub>t<\/sub>\u2212<sub>2<\/sub>,\u2026,X<sub>t<\/sub>\u2212<sub>p<\/sub> are the past values of the time series.<\/li>\n\n\n\n<li>\u03b5<sub>t<\/sub> is the error term representing the random fluctuations or unobserved factors.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"autoregression-calculation\">Autoregression calculation<\/h3>\n\n\n\n<p>The autoregressive coefficients (1, 2,&#8230;..,p) are typically estimated using statistical methods like least squares regression.<\/p>\n\n\n\n<p>In the context of&nbsp;<a href=\"https:\/\/blog.quantinsti.com\/autoregressive-moving-average-arma-model\/\">autoregressive (AR) models<\/a>, the coefficients represent the weights assigned to the lagged values of the time series to predict the current value. These coefficients capture the relationship between the current observation and its past values.<\/p>\n\n\n\n<p>The goal is to find the coefficients that best fit the&nbsp;<a href=\"https:\/\/blog.quantinsti.com\/historical-market-data-python-api\/\">historical data<\/a>, allowing the model to accurately capture the underlying patterns and trends. Once the coefficients are determined, they can be used to forecast future values in the time series based on the observed values from previous time points. Hence, the autoregression calculation helps to create an autoregressive model for time series forecasting.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"autoregression-model\">Autoregression model<\/h2>\n\n\n\n<p>Before delving into autoregression, it&#8217;s beneficial to revisit the concept of a&nbsp;<a href=\"https:\/\/blog.quantinsti.com\/machine-learning-trading-predict-stock-prices-regression\/\">regression<\/a>&nbsp;model.<a href=\"https:\/\/www.turing.com\/kb\/guide-to-autoregressive-models\">\u207d\u00b9\u207e<\/a><\/p>\n\n\n\n<p>A regression model serves as a statistical method to determine the association between a dependent variable (often denoted as y) and an independent variable (typically represented as X). Thus, in regression analysis, the focus is on understanding the relationship between these two variables.<\/p>\n\n\n\n<p>For instance, consider having the stock prices of Bank of America (ticker: BAC) and J.P. Morgan (ticker: JPM).<\/p>\n\n\n\n<p>If the objective is to forecast the stock price of JPM based on BAC&#8217;s stock price, then JPM&#8217;s stock price would be the dependent variable, y, while BAC&#8217;s stock price would act as the independent variable, X. Assuming a linear association between X and y, the regression equation would be:<\/p>\n\n\n\n<p class=\"has-text-align-center\">y = mX + c<\/p>\n\n\n\n<p>here,<br>m represents the slope, and c denotes the intercept of the equation.<\/p>\n\n\n\n<p>However, if you possess only one set of data, such as the stock prices of JPM, and wish to forecast its future values based on its past values, you can employ autoregression. Let&#8217;s denote the stock price at time&nbsp;<em>t<\/em>&nbsp;as&nbsp;<em>yt.<\/em><\/p>\n\n\n\n<p>The relationship between\u00a0<em>yt\u00a0<\/em>and its preceding value\u00a0<em>yt<\/em>\u22121 can be modelled using:<\/p>\n\n\n\n<p class=\"has-text-align-center\">AR(1) = y<sub>t<\/sub> = \u03d5<sub>1<\/sub>y<sub>t<\/sub> \u2212<sub>1<\/sub> + c<\/p>\n\n\n\n<p>Here, \u03a61 is the model parameter, and c remains the constant. This equation represents an autoregressive model of order 1, signifying regression against a variable&#8217;s own earlier values.<\/p>\n\n\n\n<p>Similar to linear regression, the autoregressive model presupposes a linear connection between&nbsp;<em>yt&nbsp;<\/em>and&nbsp;<em>yt<\/em>\u22121 , termed as autocorrelation. A deeper exploration of this concept will follow subsequently.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"autoregression-models-of-order-2-and-generalise-to-order-p\">Autoregression models of order 2 and generalise to order p<\/h3>\n\n\n\n<p>Let&#8217;s delve into autoregression models, starting with order 2 and then generalising to order&nbsp;<em>p<\/em>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"autoregression-model-of-order-2-ar-2-\">Autoregression Model of Order 2 (AR(2))<\/h3>\n\n\n\n<p>In an autoregression model of order 2 (AR(2)), the current value&nbsp;<em>yt&nbsp;<\/em>is predicted based on its two most recent lagged values, \u200byt-1 and yt-2 .<\/p>\n\n\n\n<p class=\"has-text-align-center\">y<sub>t<\/sub> = c + \u03d5<sub>1<\/sub>y<sub>t<\/sub>\u2212<sub>1<\/sub> + \u03d5<sub>2<\/sub>y<sub>t<\/sub>\u2212<sub>2<\/sub> + \u03b5<sub>t<\/sub><\/p>\n\n\n\n<p>Where,<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>c is a constant<\/li>\n\n\n\n<li>\u03d5<sub>1<\/sub> and \u03d5<sub>2<\/sub> are the autoregressive coefficients for the first and second lags, respectively<\/li>\n\n\n\n<li>\u03b5<sub>t<\/sub> represents the error term<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-generalising-to-order-p-ar-p\">Generalising to order p (AR(p))<\/h3>\n\n\n\n<p>For an autoregression model of order\u00a0<em>p<\/em>\u00a0(AR(p)), the current value\u00a0<em>yt\u00a0<\/em>is predicted based on its p most recent lagged values.<\/p>\n\n\n\n<p class=\"has-text-align-center\">y<sub>t<\/sub> = c + \u03d5<sub>1<\/sub>y<sub>t<\/sub>\u2212<sub>1<\/sub> + \u03d5<sub>2<\/sub>y<sub>t<\/sub>\u2212<sub>2<\/sub> +&#8230;+ \u03d5<sub>p<\/sub>y<sub>t<\/sub>\u2212<sub>p<\/sub> + \u03b5<sub>t<\/sub><\/p>\n\n\n\n<p>Where,\u2219<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>c is a constant <\/li>\n\n\n\n<li>\u03d5<sub>1<\/sub>\u03d5<sub>2<\/sub>,&#8230;,\u03d5<sub>p<\/sub> are the autoregressive coefficients for the respective lagged terms y<sub>t<\/sub>\u2212<sub>1<\/sub>,y<sub>t<\/sub>\u2212<sub>2<\/sub>,&#8230;y<sub>t<\/sub>\u2212<sub>p<\/sub><\/li>\n\n\n\n<li>\u03b5<sub>t<\/sub> represents the error term<\/li>\n<\/ul>\n\n\n\n<p>In essence, an AR(p) model considers the influence of the p previous observations on the current value. The choice of p depends on the specific time series data and is often determined using methods like information criteria or examination of autocorrelation and partial autocorrelation plots.<\/p>\n\n\n\n<p>The higher the order p, the more complex the model becomes, capturing more historical information but also potentially becoming more prone to overfitting. Therefore, it&#8217;s essential to strike a balance and select an appropriate p based on the data characteristics and model diagnostics.<\/p>\n\n\n\n<p><em>Stay tuned to learn about autoregression vs autocorrelation.<\/em><\/p>\n\n\n\n<p><em>Originally posted on <a href=\"https:\/\/blog.quantinsti.com\/autoregression\/\">QuantInsti<\/a> Blog.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Autoregression emerges as a powerful tool for anticipating future values in time-based data.<\/p>\n","protected":false},"author":186,"featured_media":202081,"comment_status":"open","ping_status":"closed","sticky":true,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[343,349,338,341],"tags":[851,16667,3918,595,5519],"contributors-categories":[13654],"class_list":{"0":"post-201996","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-programing-languages","8":"category-python-development","9":"category-ibkr-quant-news","10":"category-quant-development","11":"tag-algo-trading","12":"tag-autoregression","13":"tag-financial-modeling","14":"tag-python","15":"tag-time-series","16":"contributors-categories-quantinsti"},"pp_statuses_selecting_workflow":false,"pp_workflow_action":"current","pp_status_selection":"publish","acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.9 (Yoast SEO v27.4) - 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