From f.harrell at vanderbilt.edu  Sun Jun 26 23:49:31 2005
From: f.harrell at vanderbilt.edu (Frank E Harrell Jr)
Date: Sun, 26 Jun 2005 16:49:31 -0500
Subject: [Rd] Possible bug in summary of residuals with lm and weights
Message-ID: <42BF22EB.60809@vanderbilt.edu>

I'm not sure if this is intentional.  summary.lm stores weighted 
residuals whereas I think most users will want print.summary.lm to 
summarize unweighted ones as if saying summary(resid(fit)).

 > set.seed(1)
 > dat <- data.frame(y = rnorm(15), x = rnorm(15), w = 1:15)
 > f <- lm(y ~ x, weights = w, data = dat)
 > summary(f)
. . . .
Residuals:
    Min     1Q Median     3Q    Max
-8.260 -1.565  0.117  2.105  4.666
. . . .
 > resid(f)

           1           2           3           4           5           6
-0.73429677  0.06818092 -1.20558034  1.25783256  0.05231879 -1.18383039
           7           8           9          10          11          12
  0.16034166  0.59880438  0.98337588 -0.58944957  1.40690588  0.31138819
          13          14          15
-0.35111933 -2.20770335  0.89438636

 > version
platform i386-pc-linux-gnu
arch     i386
os       linux-gnu
system   i386, linux-gnu
status
major    2
minor    1.0
year     2005
month    04
day      18
language R

-- 
Frank E Harrell Jr   Professor and Chair           School of Medicine
                      Department of Biostatistics   Vanderbilt University



[Rd] Possible bug in summary of residuals with lm and weights
Frank E Harrell Jr