{"id":3455,"date":"2023-05-30T10:10:03","date_gmt":"2023-05-30T09:10:03","guid":{"rendered":"https:\/\/www.microdata.no\/?p=3455"},"modified":"2023-11-22T14:33:14","modified_gmt":"2023-11-22T13:33:14","slug":"new-analysis-functionality-cox-regression","status":"publish","type":"post","link":"https:\/\/www.microdata.no\/en\/new-analysis-functionality-cox-regression\/","title":{"rendered":"New analysis functionality: Cox regression"},"content":{"rendered":"\n<p><strong><em>Kaplan-Meier was recently introduced as a tool for simple bivariate survival analysis. We now extend this form of analysis with Cox regression, which allows you to perform causal (multivariate) analysis of factors that can be thought to influence hazard risk\/survival time.<\/em><\/strong><\/p>\n\n\n\n<!--more-->\n\n\n\n<p>Due to the characteristics of data sets designed for survival analyses, traditional regression methods are not used, but specialised survival models, of which Cox is one of the most common.<\/p>\n\n\n\n<p>In short, survival models such as Cox are used to estimate which variables affect the hazard risk the most. In contrast to standard regression analysis which estimates effects of explanatory variables on a response variable where all variables are measured at a given time, the focus in Cox models is on estimating the effect of explanatory variables on relative hazard risk linked to a specific event (death, illness, disability, unemployment etc. ) which is measured over time. More specifically, the hazard rate is estimated given by <strong><em>h(t|x)<\/em><\/strong>, i.e. the hazard rate as a function of t (time) and x (set of explanatory variables).<\/p>\n\n\n\n<p>Cox can be seen as a more formalised method for comparing the effects of explanatory variables on survival time\/hazard risk compared to Kaplan-Meier where survival rate curves are generated and shifts in these are studied through splitting according to different characteristics given by categorical variables.<\/p>\n\n\n\n<p>The Cox proportional hazard model is given by the following formula:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"105\" src=\"https:\/\/www.microdata.no\/wp-content\/uploads\/2023\/05\/image-3.png\" alt=\"\" class=\"wp-image-3457\"\/><\/figure>\n<\/div>\n\n\n<p>Note that the time component is only in the first part of the expression above: <strong><em>b<sub>0<\/sub>(t)<\/em><\/strong>. This is called &#8220;baseline hazard&#8221; and is a time-dependent base component that is scaled up or down based on the second term in which the explanatory variables are included.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to prepare data for survival analysis<\/h2>\n\n\n\n<p>Survival analyses require the following:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A defined measurement period<\/li>\n\n\n\n<li>A clear definition of the event for which the probability will be estimated<\/li>\n\n\n\n<li>A prepared dataset that must contain the following variables:<br>&#8211; Time<br>&#8211; Event<\/li>\n<\/ul>\n\n\n\n<p>The <strong>&#8220;time&#8221;<\/strong> variable must contain a measure of the time that has passed from a given start time to the specific event occurring. You can freely choose the measurement unit, e.g., days, weeks, months, or years. The only requirement is that &#8220;time&#8221; must be a numerical variable.<\/p>\n\n\n\n<p>The <strong>&#8220;event&#8221;<\/strong> variable must also be numerical and contain the value 1 for individuals where the event has actually occurred during the given measurement period. For individuals where the event may not have occurred during this period, the value is set to 0. The latter is called &#8220;censored&#8221; cases. These are individuals where it is not possible to know if the event has occurred, either because it may have occurred after the measurement period was finished, or because they have disappeared from the population during the measurement period. It is not necessary to specify the value 0; there may often be cases where &#8220;event&#8221; has the value 1 for all units (individuals).<\/p>\n\n\n\n<p>Time and event can be calculated using the import command <code>import-event<\/code> (allows you to define the event variable and measurement period and adds start dates for all events in your dataset) and the aggregation command <code>collapse(min)<\/code> (used on the start date variable to find the time of the given event given a specific value on the variable you import through <code>import-event<\/code>). It is also possible to use ready-made date variables with fixed values \u200b\u200bper unit.<\/p>\n\n\n\n<p>Click here for a full overview of procedures for setting up a dataset for time series analysis: <a href=\"https:\/\/microdata.no\/manual\/en\/eksempel\/Regresjonsanalyser\/Hvordan%20tilrettelegge%20data%20for%20overlevelsesanalyse\">https:\/\/www.microdata.no\/en\/eksempel\/how-to-prepare-data-for-survival-analysis\/<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">The analysis itself<\/h2>\n\n\n\n<p>After you have your data set ready for survival analysis, cf. section above, you can run a cox regression by using the command <code>cox<\/code> where you first enter the variable that measures &#8220;event&#8221; and then the variable that measures &#8220;time&#8221; (the order is important). Examples:<\/p>\n\n\n<div id=\"rose-block_c7adb3889625e2b840c82de421374915\" class=\"rose-code codeblock-wrapper\">\n<pre tabindex=\"0\" class=\"codeblock\"><code>cox event years norwegian age2010 i.gender\r\ncox event years norwegian age2010 i.gender, hazard\r\ncox event days norwegian age2010 i.gender\r\ncox event days norwegian age2010 i.gender, hazard<\/code><\/pre>\n<\/div>\n\n\n<p>Typical result (default):<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.microdata.no\/wp-content\/uploads\/2023\/05\/image-4.png\" alt=\"\" class=\"wp-image-3460\" width=\"410\" height=\"429\" srcset=\"https:\/\/www.microdata.no\/wp-content\/uploads\/2023\/05\/image-4.png 546w, https:\/\/www.microdata.no\/wp-content\/uploads\/2023\/05\/image-4-286x300.png 286w\" sizes=\"auto, (max-width: 410px) 100vw, 410px\" \/><figcaption class=\"wp-element-caption\">Note: &#8220;hendelse&#8221; = event, &#8220;dager&#8221; = days, &#8220;norsk&#8221; = norwegian, &#8220;alder2010&#8221; = age per 2010, &#8220;kj\u00f8nn&#8221; = gender<\/figcaption><\/figure>\n\n\n\n<p>Typical result when using the hazard rate option:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.microdata.no\/wp-content\/uploads\/2023\/05\/image-2.png\" alt=\"\" class=\"wp-image-3441\" width=\"422\" height=\"430\" srcset=\"https:\/\/www.microdata.no\/wp-content\/uploads\/2023\/05\/image-2.png 562w, https:\/\/www.microdata.no\/wp-content\/uploads\/2023\/05\/image-2-294x300.png 294w\" sizes=\"auto, (max-width: 422px) 100vw, 422px\" \/><figcaption class=\"wp-element-caption\">Note: &#8220;hendelse&#8221; = event, &#8220;dager&#8221; = days, &#8220;norsk&#8221; = norwegian, &#8220;alder2010&#8221; = age per 2010, &#8220;kj\u00f8nn&#8221; = gender<\/figcaption><\/figure>\n\n\n\n<p>Explanation of the results:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The top example shows the default display with coefficient estimates. These should be interpreted in the traditional way. Positive coefficient values \u200b\u200bmean a positive correlation between the relevant variable and hazard risk, and an implicit negative effect on survival time. Negative values \u200b\u200bmean the opposite. Zero value means no correlation.<\/li>\n\n\n\n<li>The bottom example shows estimated hazard rates instead of coefficients. These show the rate-wise change in risk for a one-unit increase in the variable in question, and must be interpreted in a different way. The zero point that suggests no correlation is here the value 1. Values \u200b\u200babove 1 mean a positive effect on risk (implicitly negative effect on survival time), and vice versa for values \u200b\u200bbelow 1.<\/li>\n\n\n\n<li>Note: Positive effect on risk (i.e. negative effect on survival time) corresponds to a steeper Kaplan-Meier survival rate curve (compared to the reference group).<\/li>\n\n\n\n<li>The command <code>coefplot<\/code> can be used in conjunction with <code>cox<\/code> for graphical display of the estimates, as in the examples above.<\/li>\n\n\n\n<li>The numbers in the main table should be interpreted in the same way as for normal regressions, e.g. <code>regress<\/code>.<\/li>\n\n\n\n<li>The overall model measurement parameters at the top:\n<ul class=\"wp-block-list\">\n<li>&#8220;Antall obs&#8221; = Number of observations: Number of observations included in the analysis population (= number of units\/individuals in the case of regular cross-sectional data sets)<\/li>\n\n\n\n<li>&#8220;Antall hendelser&#8221; = Number of events: The number of events summed over the analysis population (= the sum of the dummy variable that measures the event measured over the analysis population).<\/li>\n\n\n\n<li>Concordance (C-index): An alternative to LR chi2() as a measure of explanatory power. C-index is based on compilations of actual versus predicted values \u200b\u200bfor all units, and the value is calculated from the proportion of matching pairs of values \u200b\u200bdivided by the number of possible pairs in total. 0 is bad, 1 is best. Values \u200b\u200bshould be above 0.5.<\/li>\n\n\n\n<li>&#8220;Akkumulert overlevelsestid&#8221; = Cumulative survival time: The sum of the variable that measures time measured across all units in the population.<\/li>\n\n\n\n<li>Log likelihood: Measure of explanatory power for the model. Possible values \u200b\u200bare from minus infinity to infinity. The higher the value, the better the model. But not an intuitive measurement. Instead, use LR chi2\/Prob &gt; chi2 or C-index to assess whether the model is good.<\/li>\n\n\n\n<li>LR chi2(): Value from chi-square test<\/li>\n\n\n\n<li>Prob &gt; chi2: P-value for chi-square test. Low values \u200b\u200bare good. Used to assess whether the model is good or bad. The value should be below 0.2.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Baseline estimation is based on the Breslow method<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Kaplan-Meier was recently introduced as a tool for simple bivariate survival analysis. We now extend this form of analysis with Cox regression, which allows you to perform causal (multivariate) analysis of factors that can be thought to influence hazard risk\/survival time.<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"categories":[2],"tags":[],"class_list":["post-3455","post","type-post","status-publish","format-standard","hentry","category-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>New analysis functionality: Cox regression - microdata.no<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.microdata.no\/en\/new-analysis-functionality-cox-regression\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"New analysis functionality: Cox regression - microdata.no\" \/>\n<meta property=\"og:description\" content=\"Kaplan-Meier was recently introduced as a tool for simple bivariate survival analysis. 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