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==Implementation==
Conditional logistic regression is available in R as the function <code>clogit</code> in the <code>survival</code> package. It is in the <code>survival</code> package because the log likelihood of a conditional logistic model is the same as the log likelihood of a Cox model with a particular data structure.<ref>{{cite web |url=https://stat.ethz.ch/R-manual/R-devel/library/survival/html/clogit.html |title=R documentation Conditional logistic regression |last1=Lumley |first1=Thomas |date= |website= |publisher= |access-date=November 3, 2016}}</ref>
==Related tests==
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