Nothing
stats <- function(x) {
c( mean = mean(x),
SS = sum( (x - mean(x))^2 )
)}
summary(coag~diet, data=coagulation, fun=stats) -> s; s
s <- unclass(s) # now we can access as a matrix
grandMean <- mean(coagulation$coag); grandMean
groupMean <- s[coagulation$diet,2]; groupMean
SST <- sum((coagulation$coag - grandMean)^2); SST # total variation
SSE <- sum((coagulation$coag - groupMean)^2); SSE # w/in group variation
SSM <- sum((groupMean - grandMean)^2 ); SSM # b/w group variation
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