[R] correlation predictors problem

[Peter Dalgaard BSA]

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 ,
> attr(,"legend")
> [1] 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
think so. 

-- 
   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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