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
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 Median 3QMax -1.465e-16 1.564e-18 1.764e-17 2.147e-17 3.492e-17 Coefficients: Es

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

2014-03-12 Thread Andrews, Chris
I get what I would expect. The tstat and the Fstat are both undefined (0/0); as are the p-values > n=10;k=1;summary(lm(rep(k,n)~rnorm(n))) Call: lm(formula = rep(k, n) ~ rnorm(n)) Residuals: Min 1Q Median 3QMax 0 0 0 0 0 Coefficients: Esti