{"id":11767,"date":"2021-03-01T11:40:36","date_gmt":"2021-03-01T11:40:36","guid":{"rendered":"https:\/\/analystprep.com\/study-notes\/?p=11767"},"modified":"2022-04-19T02:45:55","modified_gmt":"2022-04-19T02:45:55","slug":"estimated-regression-coefficients","status":"publish","type":"post","link":"https:\/\/analystprep.com\/study-notes\/cfa-level-2\/quantitative-method\/estimated-regression-coefficients\/","title":{"rendered":"Estimated Regression Coefficients"},"content":{"rendered":"<h3 id=\"mce_22\" class=\"editor-rich-text__tinymce mce-content-body\" data-is-placeholder-visible=\"false\">[vsw id=&#8221;8E2AbtAb0a8&#8243; source=&#8221;youtube&#8221; width=&#8221;611&#8243; height=&#8221;344&#8243; autoplay=&#8221;no&#8221;]<\/h3>\n<p>The intercept term is defined as the value of the dependent variable when the independent variables are zero. On the other hand, each slope coefficient is the estimated change in the value of the dependent variable for a one-unit change in the value of the respective independent variable, keeping the other independent variables constant. Slope coefficients are also called <strong>partial slope coefficients.<\/strong><\/p>\n<h3>Example: Understanding Slop Coefficients<\/h3>\n<p>Consider the multiple regression of the price of USDX on inflation rates and real rates of interest:<\/p>\n<p>$$P=81-276INF+902IR$$<\/p>\n<p>Where:<\/p>\n<ul>\n<li>P = Price of the US Dollar index.<\/li>\n<li>INF = Annual inflation rate.<\/li>\n<li>IR = Annual real rate of interest.<\/li>\n<\/ul>\n<p>The regression equation is interpreted as follows:<\/p>\n<p>The intercept term of 81 implies that the price of USDX is $81 when both the inflation rate and real interest rate are 0.<\/p>\n<p>A 1% increase in the inflation rate leads to a $276 decrease in the price of USDX, keeping real interest rates constant. On the other hand, a 1% increase in the real interest rate leads to a $902 increase in the price of USDX, keeping the inflation rate constant.<\/p>\n<h2>Interpreting p-values<\/h2>\n<p>A p-value is the smallest significance level \\((\\alpha)\\) at which we reject the null hypothesis \\((H_{0})\\). In other words, a p-value quickly allows us to establish if an independent variable is significant at a significance level such as 5%.<\/p>\n<p>A p-value below 0.05 indicates a significant result. The null hypothesis \\(H_0\\) should be rejected when the p-value \\(&lt; 0.05\\). The following table illustrates two-tailed p-values, which is what we will be concentrating on throughout these readings (except for F-tests, which are one-sided tests).<\/p>\n<h3><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-12798\" src=\"https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2021\/03\/cfa-level-2-two-sided-test.jpg\" alt=\"\" width=\"1473\" height=\"900\" srcset=\"https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2021\/03\/cfa-level-2-two-sided-test.jpg 1473w, https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2021\/03\/cfa-level-2-two-sided-test-300x183.jpg 300w, https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2021\/03\/cfa-level-2-two-sided-test-1024x626.jpg 1024w, https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2021\/03\/cfa-level-2-two-sided-test-768x469.jpg 768w, https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2021\/03\/cfa-level-2-two-sided-test-400x244.jpg 400w\" sizes=\"auto, (max-width: 1473px) 100vw, 1473px\" \/>Example: Interpreting p-values<\/h3>\n<p>Consider the following multiple regression results of the price of USDX versus inflation rate and real interest rate.<\/p>\n<p>$$\\small{\\begin{array}{l|c|c|c|c}{}&amp; \\textbf{Coefficients} &amp; \\textbf{Standard Error} &amp; \\textbf{t-statistic} &amp; \\textbf{p-value}\\\\ \\hline\\text{Intercept} &amp; 81 &amp; 7.9659 &amp; 10.1296 &amp; 0.0000\\\\ \\hline\\text{Inflation rates} &amp; -276 &amp; 233.0748 &amp; -1.1833 &amp; 0.2753\\\\ \\hline\\text{Real interest rates} &amp; 902 &amp; 279.6949 &amp; 3.2266 &amp; 0.0145\\\\ \\end{array}}$$<\/p>\n<p>The above results imply that the real interest rate is statistically significant at the 5% level. This is because the p-value, 0.0145, is less than 0.05.<\/p>\n<p>On the other hand, real inflation rate is not significant. This can be seen be corroborated by the high standard error, low t-statistic, and relatively high p-value above 0.05.<\/p>\n<blockquote>\n<h2>Question<\/h2>\n<p>Adil Suleman, CFA, wishes to establish the possible drivers of a company\u2019s percentage return on capital (ROC). Suleman identifies performance measures such as the profit margin (%), sales, and debt ratio as possible drivers of ROC. He obtains the following results from the regression of ROC on profit margin (%), sales, and the debt ratio.<\/p>\n<p>$$ \\textbf{Exhibit 1: Summary Output} $$<\/p>\n<p>$$\\small{\\begin{array}{|l|l|l|l|l|l|}\\hline{}&amp; \\textbf{Coefficients} &amp; \\textbf{Standard Error} &amp; \\textbf{t-statistic} &amp; \\textbf{p-value} \\\\ \\hline\\text{Intercept} &amp; 8.6531 &amp; 0.9174 &amp; 9.4323 &amp; 0.0000 \\\\ \\hline \\text{Sales} &amp; 0.0009 &amp; 0.0005 &amp; 1.7644 &amp; 0.0922\\\\ \\hline\\text{Debt ratio} &amp; 0.0229 &amp; 0.0165 &amp; 1.3880 &amp; 0.1797 \\\\ \\hline\\text{Profit margin (%)} &amp; 0.2996 &amp; 0.0564 &amp; 5.3146 &amp; 0.0000\\\\ \\hline\\end{array}}$$<\/p>\n<p>Which of the independent variables is (are) most likely statistically significantly different from zero at the 5% significance level, assuming the sample size is 25?<\/p>\n<p>\u00a0 \u00a0 \u00a0A. Profit margin.<\/p>\n<p>\u00a0 \u00a0 \u00a0B. Sales and profit margin.<\/p>\n<p>\u00a0 \u00a0 \u00a0C. Sales and debt ratio.<\/p>\n<h3>Solution<\/h3>\n<p><strong>The correct answer is A.<\/strong><\/p>\n<p>An independent variable is statistically significant if its p-value is less than the significance level, in this case, 5%, or 0.05. Therefore, only the profit margin is statistically significantly different from zero at the 5% significance level.<\/p>\n<\/blockquote>\n<p>Reading 2: Multiple Regression<\/p>\n<p><em>LOS 2 (b) Interpret estimated regression coefficients and their <\/em>p<em>-value.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>[vsw id=&#8221;8E2AbtAb0a8&#8243; source=&#8221;youtube&#8221; width=&#8221;611&#8243; height=&#8221;344&#8243; autoplay=&#8221;no&#8221;] The intercept term is defined as the value of the dependent variable when the independent variables are zero. On the other hand, each slope coefficient is the estimated change in the value of the&#8230;<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[102,229],"tags":[216,240,230],"class_list":["post-11767","post","type-post","status-publish","format-standard","hentry","category-cfa-level-2","category-quantitative-method","tag-cfa-level-2","tag-estimated-regression-coefficients","tag-quantitative-method","blog-post","no-post-thumbnail","animate"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Estimated Regression Coefficients - CFA, FRM, and Actuarial Exams Study Notes<\/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:\/\/analystprep.com\/study-notes\/cfa-level-2\/quantitative-method\/estimated-regression-coefficients\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Estimated Regression Coefficients - CFA, FRM, and Actuarial Exams Study Notes\" \/>\n<meta property=\"og:description\" content=\"[vsw id=&#8221;8E2AbtAb0a8&#8243; source=&#8221;youtube&#8221; width=&#8221;611&#8243; height=&#8221;344&#8243; autoplay=&#8221;no&#8221;] The intercept term is defined as the value of the dependent variable when the independent variables are zero. 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