Re: [R] summary.lm() for zero variance response

2014-03-12 Thread Andrews, Chris
2014 8:37 AM To: Andrews, Chris; r-help@r-project.org Subject: Re: [R] summary.lm() for zero variance response Hi Chris, Here my output (I have not yet installed R 3.0.3) > n=10;k=1;summary(lm(rep(k,n)~rnorm(n))) Call: lm(formula = rep(k, n) ~ rnorm(n)) Residuals: Min 1Q

Re: [R] summary.lm() for zero variance response

2014-03-12 Thread Vito M. R. Muggeo
ted R-squared:NaN F-statistic: NaN on 1 and 8 DF, p-value: NA sessionInfo() R version 3.0.2 (2013-09-25) Platform: x86_64-w64-mingw32/x64 (64-bit) -Original Message- From: Vito M. R. Muggeo [mailto:vito.mug...@unipa.it] Sent: Wednesday, March 12, 2014 6:27 AM To: r-help@r-project.org Subje

Re: [R] summary.lm() for zero variance response

2014-03-12 Thread Andrews, Chris
nipa.it] Sent: Wednesday, March 12, 2014 6:27 AM To: r-help@r-project.org Subject: [R] summary.lm() for zero variance response dear all, a student of mine brought to my attention the following, somewhat odd, behaviour of summary.lm() when the response variance is zero (yes, possibly meaningless from a

[R] summary.lm() for zero variance response

2014-03-12 Thread Vito M. R. Muggeo
dear all, a student of mine brought to my attention the following, somewhat odd, behaviour of summary.lm() when the response variance is zero (yes, possibly meaningless from a practical viewpoint). Namely something like n=10;k=1;summary(lm(rep(k,n)~rnorm(n))) The values of k, n and the covari