search for: eggsize

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2007 Aug 30
1
t-test within tapply
Hello, My data are as following: Data <- data.frame(Ind=rep(1:3,c(10,10,10)), Replicate=rep(c(rep("a",5),rep("b",5)),3), EggSize=rep(rnorm(5,mean=10),6) ) attach(Data) Using a t-test, I want to check if the mean egg sizes are significantly different between replicates a and b for each individuals (ie. In that case, 3 outputs with 3 p-values). I tried the following, but doesn't work:...