df fot BETA t-test in ANCOVA

#1
Hi All,

Perhaps this would be a silly question but,
in ANCOV, what is the DF for t-test value for a covariate BETA coefficient calculated across all compared groups (i.e. beta like in a regression between covariate and DV but in ancova).
Spss and Statistica give only t and p values but no df

Thanks a lot

D.