This works:
model.matrix(~I(pos3),data=data.frame(pos=c(1:5)))
(Intercept) I(pos 3)TRUE
1 1 0
2 1 0
3 1 0
4 1 1
5 1 1
attr(,assign)
[1] 0 1
attr(,contrasts)
Trevor Hastie [EMAIL PROTECTED] writes:
This does not:
model.matrix(~I(pos3),data=data.frame(pos=c(1:2)))
Error in contrasts-(`*tmp*`, value = contr.treatment) :
contrasts can be applied only to factors with 2 or more levels
Oh yes it does:
From: Peter Dalgaard
Trevor Hastie [EMAIL PROTECTED] writes:
This does not:
model.matrix(~I(pos3),data=data.frame(pos=c(1:2)))
Error in contrasts-(`*tmp*`, value = contr.treatment) :
contrasts can be applied only to factors with 2 or more levels
Oh yes it does:
Ditto here.
Trevor's problem is reproducible on R 1.8.1 (which is what he was using) on
both Linux RHEL 3.0 and Solaris and R 1.8.0 on Windows.
- Original Message -
From: Trevor Hastie [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Thursday, June 24, 2004 3:12 PM
Subject: [R] problem
BN == Balasubramanian Narasimhan [EMAIL PROTECTED] writes:
BN Trevor's problem is reproducible on R 1.8.1 (which is what he
BN was using) on both Linux RHEL 3.0 and Solaris and R 1.8.0 on
BN Windows.
Yep, on my Linux box (details below) I have the same problem with R
1.8.1 but no
