search for: spinelength

...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 summary(aov(Spinelength ~ Male/Female)) I get the same mean squares either way, which doesn't seem right to me. In the former case, the mean square for females should be calculated around the overall mean across all females, whereas the mean square in the latter case sh...