Now, I am working with some design matrices. My problem is to set
"contrasts" option. Now I want to use "contr.sum" as the option, and it
works properly. However, this option sets the last element of a factor
as -1. For example, if I have a factor which has 5 elements and want to
use the "contr.sum" option, the 5th elements is always set to -1. I want
set -1 to other element such as 1st or 2nd. Is it possible? 
 
Thank you in advance.
 
 
Yongwan Chun

	[[alternative HTML version deleted]]


