PROBLEM: PROC LOGISTIC (aka PROC LOGIST) terminates with an error
         message as follows:

    ERROR: Floating Point Overflow.
    NOTE: The SAS System stopped processing this step because of errors.

CAUSE:  In most cases, the floating point overflow message in 
        PROC LOGISTIC is a result of the maximum likelihood solution 
        not existing.  This will cause some of the parameters to 
        become infinite and the procedure fails to converge.  It is
        common for the maximum likelihood solution to not exist 
        when there are few or no repeated observations at each 
        observed setting of the covariates.  

SOLUTION: The solution to this problem is to either simplify 
          the model or make the data more dense by categorizing covariates. 

(NOTE: The explanation and solution shown above are repeated verbatim
       from eMail received from a SAS Institute statistician on 
       6 October 1998.)