[R] Using xtable with summaries of lm objects
Martin Maechler
maechler at stat.math.ethz.ch
Tue Jun 22 14:49:52 CEST 2004
>>>>> "Peter" == Peter Dunn <dunn at usq.edu.au>
>>>>> on Tue, 22 Jun 2004 10:02:16 +1000 writes:
Peter> Hi all
Peter> Suppose I do the following:
Peter> set.seed(1000)
Peter> library(xtable)
Peter> x <- runif( 10 )
Peter> y <- 1 + 2*x + rnorm( length(x) )
Peter> test.lm <- lm( y ~ x )
Peter> summary( test.lm )
Peter> xtable ( summary( test.lm ) )
Peter> The final xtable output follows:
Peter> % latex table generated in R 1.8.1 by xtable 1.2-2 package
Peter> % Tue Jun 22 09:56:36 2004
Peter> \begin{table}[ht]
Peter> \begin{center}
Peter> \begin{tabular}{rrrrr}
Peter> \hline
Peter> & Estimate & Std. Error & t value & Pr($>$$|$t$|$) \\
Peter> \hline
Peter> (Intercept) & 0.5731 & 0.4396 & 1.30 & 0.2286 \\
Peter> x & 1.9680 & 0.8894 & 2.21 & 0.0578 \\
Peter> \hline
Peter> \end{tabular}
Peter> \end{center}
Peter> \end{table}
Peter> Notice this line:
Peter> & Estimate & Std. Error & t value & Pr($>$$|$t$|$) \\
Peter> This will not LaTeX correctly, as teh string `$$' occurs;
Peter> presumably it should read something like:
Peter> & Estimate & Std. Error & t value & Pr({$>$}{$|$}t$|$) \\
Peter> or (better IMHO):
Peter> & Estimate & Std. Error & $t$ value & Pr($>|t|$) \\
Peter> I searched the archives, and couldn't find any reference to this
Peter> bug;
yes, it's a bug.
Peter> perhaps its just me! Is there a known workaround (as I want
Peter> to auto-generate these table using Sweave; I know I could
Peter> cut-and-paste the table, and correct as appropriate).
R and xtable are open source ... ;-)
and the posting guide tells you to ask package authors even
before posting to R-help..
(I've now at least CC'ed xtable's author).
When looking at the xtable source,
you'll realize quickly that xtable/R/xtable.R
has the ingredients:
xtable.summary.lm() is the function that could be improved
and
xtable.anova will probably serve as an example on how to
treat the "Pr(>|t|)" as special case.
Theoretically better would be to deal with such "P(..)" strings
more ``package globally'', probably in xtable.data.frame() or
xtable.matrix()
{and obviate the need for both xtable.anova() and xtable.summary.lm()'s
special treatment -- automatically dealing correctly with
similar classes}.
--
Martin Maechler
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