{"id":4166,"date":"2024-04-16T09:30:01","date_gmt":"2024-04-16T07:30:01","guid":{"rendered":"https:\/\/www.psyctc.org\/psyctc\/?post_type=docs&#038;p=4166"},"modified":"2024-04-16T09:30:02","modified_gmt":"2024-04-16T07:30:02","password":"","slug":"intercept","status":"publish","type":"docs","link":"https:\/\/www.psyctc.org\/psyctc\/glossary2\/intercept\/","title":{"rendered":"Intercept"},"content":{"rendered":"\n<p>The intercept, with the slope, define a linear regression.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Details<\/h4>\n\n\n\n<p>It&#8217;s just this point (in the plot below) where the straight line of the regression cuts the y axis, the x = 0 line.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/www.psyctc.org\/psyctc\/wp-content\/uploads\/2024\/04\/linearRegression2intercept-1024x683.png\" alt=\"\" class=\"wp-image-4167\" srcset=\"https:\/\/www.psyctc.org\/psyctc\/wp-content\/uploads\/2024\/04\/linearRegression2intercept-1024x683.png 1024w, https:\/\/www.psyctc.org\/psyctc\/wp-content\/uploads\/2024\/04\/linearRegression2intercept-300x200.png 300w, https:\/\/www.psyctc.org\/psyctc\/wp-content\/uploads\/2024\/04\/linearRegression2intercept-768x512.png 768w, https:\/\/www.psyctc.org\/psyctc\/wp-content\/uploads\/2024\/04\/linearRegression2intercept-1536x1024.png 1536w, https:\/\/www.psyctc.org\/psyctc\/wp-content\/uploads\/2024\/04\/linearRegression2intercept-2048x1365.png 2048w, https:\/\/www.psyctc.org\/psyctc\/wp-content\/uploads\/2024\/04\/linearRegression2intercept-360x240.png 360w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>The main place you are likely to encounter the issue of intercepts is in multi-level modelling of trajectories of change where allowing &#8220;free intercepts&#8221; for different clients amounts to recognising that different clients start at different scores on whatever measure is being used.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Try also<\/h4>\n\n\n\n<p><a href=\"https:\/\/www.psyctc.org\/psyctc\/glossary2\/multilevel-models-modelling-mlm\/\" title=\"\">Multilevel models<\/a><br><a href=\"https:\/\/www.psyctc.org\/psyctc\/glossary2\/regression-and-linear-regression\/\" title=\"\">Regression and linear regression<\/a><br><a href=\"https:\/\/www.psyctc.org\/psyctc\/glossary2\/slope-in-linear-regression\/\" title=\"\">Slope (in linear regression)<\/a><\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Chapters<\/h4>\n\n\n\n<p>Doesn\u2019t feature in any of the chapters though the analyses mentioned in Chapters 7 and 8 use related methods.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Online resources<\/h4>\n\n\n\n<p>Not yet.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Dates<\/h4>\n\n\n\n<p>First created 16.iv.24.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The intercept, with the slope, define a linear regression. Details It&#8217;s just this point (in the plot below) where the straight line of the regression cuts the y axis, the x = 0 line. The main place you are likely to encounter the issue of intercepts is in multi-level modelling of trajectories of change where &hellip; <a href=\"https:\/\/www.psyctc.org\/psyctc\/glossary2\/intercept\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Intercept<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","template":"","meta":{"footnotes":""},"doc_category":[18],"glossaries":[],"doc_tag":[],"knowledge_base":[],"class_list":["post-4166","docs","type-docs","status-publish","hentry","doc_category-om-book"],"year_month":"2026-04","word_count":112,"total_views":"886","reactions":{"happy":"0","normal":"0","sad":"0"},"author_info":{"name":"chris","author_nicename":"chris","author_url":"https:\/\/www.psyctc.org\/psyctc\/author\/chris\/"},"doc_category_info":[{"term_name":"All OM book glossary entries","term_url":"https:\/\/www.psyctc.org\/psyctc\/glossary\/non-knowledgebase\/om-book\/"}],"doc_tag_info":[],"knowledge_base_info":[],"knowledge_base_slug":[],"_links":{"self":[{"href":"https:\/\/www.psyctc.org\/psyctc\/wp-json\/wp\/v2\/docs\/4166","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.psyctc.org\/psyctc\/wp-json\/wp\/v2\/docs"}],"about":[{"href":"https:\/\/www.psyctc.org\/psyctc\/wp-json\/wp\/v2\/types\/docs"}],"author":[{"embeddable":true,"href":"https:\/\/www.psyctc.org\/psyctc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.psyctc.org\/psyctc\/wp-json\/wp\/v2\/comments?post=4166"}],"version-history":[{"count":2,"href":"https:\/\/www.psyctc.org\/psyctc\/wp-json\/wp\/v2\/docs\/4166\/revisions"}],"predecessor-version":[{"id":4169,"href":"https:\/\/www.psyctc.org\/psyctc\/wp-json\/wp\/v2\/docs\/4166\/revisions\/4169"}],"wp:attachment":[{"href":"https:\/\/www.psyctc.org\/psyctc\/wp-json\/wp\/v2\/media?parent=4166"}],"wp:term":[{"taxonomy":"doc_category","embeddable":true,"href":"https:\/\/www.psyctc.org\/psyctc\/wp-json\/wp\/v2\/doc_category?post=4166"},{"taxonomy":"glossaries","embeddable":true,"href":"https:\/\/www.psyctc.org\/psyctc\/wp-json\/wp\/v2\/glossaries?post=4166"},{"taxonomy":"doc_tag","embeddable":true,"href":"https:\/\/www.psyctc.org\/psyctc\/wp-json\/wp\/v2\/doc_tag?post=4166"},{"taxonomy":"knowledge_base","embeddable":true,"href":"https:\/\/www.psyctc.org\/psyctc\/wp-json\/wp\/v2\/knowledge_base?post=4166"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}