Exact Logistic Regression Sas. Many exact statistical tests have already been added to the FREQ and NPAR1WAY procedures and as of SAS 81 SASSTAT software includes exact logistic regression for binary dichotomous response variables in the LOGISTIC procedure. If you have a binary outcome measured repeatedly for each subject and you wish to run a logistic regression that accounts for the effect of multiple measures from single subjects you can perform a repeated measures logistic regression.
See the section Exact Conditional Logistic Regression for more details. Agresti 1990. Derr SAS Institute Inc Cary NC ABSTRACT Exact logistic regression has become an important analytical technique especially in the pharmaceuti-cal industry since the usual asymptotic methods for analyzing small skewed or sparse data sets are un-reliable.
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The theory of exact logistic regression also known as exact conditional logistic regression was originally laid out by Cox 1970 and the computational methods employed in PROC LOGISTIC are described in Hirji Mehta and Patel 1987. Exact methods for generalized logit GLOGIT models have been available in the LOGISTIC procedure since SAS. Other useful references for the derivations include Cox and Snell 1989. Proc logistic data WORKIMPORT desc.
