[R] correlation predictors problem
Peter Dalgaard BSA
p.dalgaard at biostat.ku.dk
Tue Sep 11 10:12:27 CEST 2001
Robert Espesser -- CNRS <Robert.Espesser at lpl.univ-aix.fr> writes:
> R colleagues,
> I want
> to get the correlation between the coefficients of a regression.
> Everything seems OK, but when there are more than 3 regressors, the
> correlation matrix is completely wrong, as follows:
> Correlation of Coefficients:
> ( dP dI dC mHP
> durP 1
> durI 1
> durC 1
> moyHzPB . 1
> moyHzIN ,
>  0 ` ' 0.3 `.' 0.6 `,' 0.8 `+' 0.9 `*' 0.95 `B' 1
Um, wrong in what way?
If you just think this looks weird, blame Martin who wrote the code
for displaying correlation matrices like this. See the help for
symnum() for what it means. You can turn this off by passing
symbolic.cor=FALSE to print.summary.lm.
If the actual correlations are wrong, you need to tell us why you
O__ ---- Peter Dalgaard Blegdamsvej 3
c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907
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