I'm trying to conduct a post-hoc analysis which simultaniously corrects for a covariate. I tried GLM --> Univariate but when I select a covariate, the post-hoc button turns inactive. Unfortunately I'm not a statistics genius.
Does anybody know a solution?

Thanks in advance,

Casper

I assume you're using SPSS?

I found a link to a pdf document that describes this issue and covers the use of contrasts to get around the problem.

http://www.sussex.ac.uk/Users/andyf/teaching/rm2/ancova.pdf

thank you very much. It could be very usefull to me.

please i have the same problem please helpe me

I'm trying to conduct a post-hoc analysis which simultaniously corrects for a covariate. I tried GLM --> Univariate but when I select a covariate, the post-hoc button turns inactive. Unfortunately I'm not a statistics genius.
Does anybody know a solution?

Thanks in advance,

howcanshe@*****.com