Create contrast matrix
Create contrast matrix typically for use with 'estimate' (Wald tests).
contr(p, n, diff = TRUE, ...)
p |
index of non-zero entries (see example) |
n |
Total number of parameters (if omitted the max number in p will be used) |
diff |
If FALSE all non-zero entries are +1, otherwise the second non-zero element in each row will be -1. |
... |
Additional arguments to lower level functions |
contr(2,n=5)
contr(as.list(2:4),n=5)
contr(list(1,2,4),n=5)
contr(c(2,3,4),n=5)
contr(list(c(1,3),c(2,4)),n=5)
contr(list(c(1,3),c(2,4),5))
parsedesign(c("aa","b","c"),"?","?",diff=c(FALSE,TRUE))Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.