@Ksharp provides some important information regarding how SAS handles categorical (CLASS) variables in its modeling. One level will always have a coefficient of zero, making the true value of the coefficient for this level = zero + intercept (for a simple one-way design), while the other variables will have a coefficient = (coefficient shown) + intercept (for a simple one-way design).
A better way to estimate the effect of CLASS variables in SAS is to use the LSMEANS command, and then this problem goes away. Each level (even the one with the zero coefficient) is shown with the math above computed for you.
If I may be so bold, you have entitled two recent posts "Statistics", and "Statistics" is a very very very very broad topic, and not a good title. You would be wise to provide more meaningful (and not so broad) title such as "Coefficients in PROC LOGISTIC".
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