Variable names are alphanumeric but must start with a letter. The length of a variable name is limited to thirty-two characters for non-SAS data set variables Model variables are declared by VAR, ...

Constant and almost constant variables are zeroed and ignored. As long as the dependent variable is not constant, PROC TRANSREG produces an iteration history table for all models, not just models in ...

In the bad old days, I only used constants as a way to assign names to values. Things like this, for example: Private Const DaysInWeek As Integer = 7 However, these days most of my variables are ...