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...contrast" How do I build these contrasts? Ideally, I would like to have the posthoc test for the ANCOVA including a block-effect a2<-aov(seeds~treatment*length+Error(site)) How do I make a posthoc test here? Thanks for any comments Walter -- ***** Dr. Walter Durka Department Bioz?noseforschung Department of community ecology Helmholtz-Zentrum f?r Umweltforschung GmbH - UFZ Helmholtz Centre for Environmental Research - UFZ Theodor-Lieser-Str. 4 / 06120 Halle / Germany walter.durka at ufz.de / http://www.ufz.de/index.php?en=798 phone +49 345 558 5314 / Fax +49 345 558 5329 +++++++++++++...

...see this probably obvious solution with R how to do this? Sorry if this question is silly...it's too hot here to think properly ;O) Thanks! cheers Marten -- -------------------------------------------------------------------------------------------- Dr. Marten Winter / Researcher Bioz?noseforschung / Community Ecology Helmholtz-Zentrum f?r Umweltforschung GmbH - UFZ Helmholtz Centre for Environmental Research GmbH - UFZ Theodor-Lieser-Str. 4 / 06120 Halle (Saale) / Germany Telefon +49 345 558 5316 / Fax +49 345 558 5329 marten.winter at ufz.de / www.ufz.de/index.php?en=7081 Sitz der G...