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I recently reviewed a paper that used Wald's Z in a mixed model analysis. The dataset (see end of message for complete dataset) has individual animals (SAMPLE) from within social groups, from within geographic regions. Y is the response variable. The paper ran a mixed model with year and region as fixed effects, group a random effect nested within region, and sample nested within group. I

Hi, I'm trying to work through a Nested ANOVA for the following scenario: 20 males were used to fertilize eggs of 4 females per male, so that female is nested within male (80 females used total). Spine length was measured on 11 offspring per family, resulting in 880 measurements on 80 families. I used the following two commands: summary(aov(Spinelength ~ Male*Female)) and

Hi, I'm wrestling with an analysis of a dataset, which I previously analyzed in SYSTAT, but am now converting to R and was doing a re-analysis. I noticed, however, that the same model yields different results (different sums of squares) from the two programs. I first thought this might be because the two programs use different calculations to get the sums of squares, but the problem