PROC GLM Estimate statement: if group has 8 levels, do I need to include all in effect-values?

[Dcicantab5]

PROC GLM Estimate statement: if group has 8 levels (groups 1-8), do I need to include all in effect-values even though I am testing say, 4 groups only? 

e.g. estimate group 4 vs group 2 among groups 2, 3, 4, 5?

I plan to do only for comparisons (hence Bonferroni 0.05/4 rather than 0.05/8)

thanks,

Saiful.

[Ksharp]

I guess you only need to specify the first N level.

E.X.

estimate 'A1 VS A2' A 1 -1;

even A have more than two levels .

[SteveDenham]

This is a great case for the LSMESTIMATE statement, available in PROC MIXED or GLIMMIX.  Take a look at the shared concepts documentation for this statement, and it should be readily apparent how to do the comparisons you want, in  a series of comma separated statments, followed by /adjust=bon; for a Bonferroni adjustment.

It is pretty easy to port GLM code to MIXED or GLIMMIX.

Steve Denham