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iyear
2006 Apr 13
5
Questions on formula in princomp
I hope this time I'm using the "iris" dataset correctly:
ir <- rbind(iris3[,,1], iris3[,,2], iris3[,,3])
lir <- data.frame(log(ir))
names(lir) <- c("a","b","c","d")
I'm trying to understand the meaning of expressions like "~ a+b+c+d",
used with princomp, e.g.
princomp(~ a+b+c+d, data=lir, cor=T)
By inspection, it