Hello.

I fit the following ANCOVA model and want to conduct some planned contrasts tests within factor paycondition:

anova wbiam i.paycondition c.sdbam i.paycondition#c.sdbam

paycondition has 3 groups. I used the following code to compare within the groups right after running the above anova code.
contrast r.paycondition
contrast ar.paycondition

However, I also found the following code to do planned contrasts, for the contrast comparing group1 and group2:
anovacontrast paycondition, values (1 -1 0)

The two types of code give me different p-values and test statistics. I'm not sure which way to rely on.

Thanks for your help.