topic Re: PROC LOGISTIC: what is the requirement of minimal number of responders in binary logistic regression in Statistical Procedures https://communities.sas.com/t5/Statistical-Procedures/PROC-LOGISTIC-what-is-the-requirement-of-minimal-number-of/m-p/106444#M5584 <HTML><HEAD></HEAD><BODY><P>First off, the dependent variable ought to be better represented as responders/(responders + nonresponders), otherwise you could get a ratio larger than one, which would not fit into logistic regression.</P><P></P><P>Once you get that going, I think I have seen a rule of thumb of 10 responders per independent variable estimated in the model.&nbsp; Should be a good starting place.</P><P></P><P>Steve Denham</P></BODY></HTML> Tue, 08 Oct 2013 15:32:50 GMT SteveDenham 2013-10-08T15:32:50Z PROC LOGISTIC: what is the requirement of minimal number of responders in binary logistic regression https://communities.sas.com/t5/Statistical-Procedures/PROC-LOGISTIC-what-is-the-requirement-of-minimal-number-of/m-p/106443#M5583 <HTML><HEAD></HEAD><BODY><P>This is an empirical question. To develop a binary logistic regression model, what is the requirement of minimal number of responders (if the dependent variable is responders /nonresponders)?</P></BODY></HTML> Tue, 08 Oct 2013 14:41:44 GMT https://communities.sas.com/t5/Statistical-Procedures/PROC-LOGISTIC-what-is-the-requirement-of-minimal-number-of/m-p/106443#M5583 jcpenny2002 2013-10-08T14:41:44Z Re: PROC LOGISTIC: what is the requirement of minimal number of responders in binary logistic regression https://communities.sas.com/t5/Statistical-Procedures/PROC-LOGISTIC-what-is-the-requirement-of-minimal-number-of/m-p/106444#M5584 <HTML><HEAD></HEAD><BODY><P>First off, the dependent variable ought to be better represented as responders/(responders + nonresponders), otherwise you could get a ratio larger than one, which would not fit into logistic regression.</P><P></P><P>Once you get that going, I think I have seen a rule of thumb of 10 responders per independent variable estimated in the model.&nbsp; Should be a good starting place.</P><P></P><P>Steve Denham</P></BODY></HTML> Tue, 08 Oct 2013 15:32:50 GMT https://communities.sas.com/t5/Statistical-Procedures/PROC-LOGISTIC-what-is-the-requirement-of-minimal-number-of/m-p/106444#M5584 SteveDenham 2013-10-08T15:32:50Z