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...2.319e-06 *** --- > ffactor1<-(18.699/15)/(38.973/42) [1] 1.343422 > 1-pf(ffactor1,15,42)/ [1] 0.2206373 Thanks in advance for your answer, and sorry if my question doesn't fit with the R-help list. Agn?s Coutellec -- Marie-Agn?s Coutellec UMR INRA-Agrocampus 985 EQHC Equipe Ecotoxicologie et Qualit? des Milieux Aquatiques 65 rue de Saint-Brieuc - CS 84215 35042 Rennes cedex - FRANCE t?l.: +33(0)2 23 48 52 48 fax: +33(0)2 23 48 54 40

...factors (pop and family) which I want to nest within poptype. Which of these formulae should I use ? 1. lmer(y~poptype*matingtype + (1|poptype/pop/fam)) 2. lmer(y~poptype*matingtype + (poptype|/pop/fam)) thanks in advance Agnes -- Marie-Agn?s Coutellec UMR INRA-Agrocampus Ouest 985 ESE Equipe Ecotoxicologie et Qualit? des Milieux Aquatiques 65 rue de Saint-Brieuc - CS 84215 35042 Rennes cedex - FRANCE t?l.: +33(0)2 23 48 52 48 fax: +33(0)2 23 48 54 40