[R] Printing correlation matrices (lm/glm)

[Liaw, Andy]

Try print(summary(lm2, corr=TRUE), symbolic.corr=FALSE).  It *is* in the
help page.

HTH,
Andy

> From: Ted.Harding at nessie.mcc.ac.uk 
> Subject: [R] Printing correlation matrices (lm/glm)
> 
> Hi Folks,
> 
> I'm analysing some data which, in its simplest aspect,
> has 3 factors A, B, C each at 2 levels.
> 
> If I do
> 
>   lm1 <- lm(y ~ A*B)
> 
> say, and then
> 
>   summary(lm1, corr=T)
> 
> I get the correlation matrix of the estimated coeffcients
> with numerical values for the correlations (3 coeffs in this
> case). Likewise with 'glm' instead of 'lm'.
> 
> However, if I do
> 
>   lm2 <- lm(y ~ A*B*C)
> 
> and then
> 
>   summary(lm2, corr=T)
> 
> I get only symbols (such as ".", "+", "*") for the values,
> denoting ranges, and not numbers (7 coefficients in this case).
> 
> Presumably this happens when the number of columns is considered
> to be getting a bit large for numbers -- though 7 is not huge ...
> 
> Anyway, is there any way I can get the full correlation matrix
> out with numbers instead of symbols, even with several coefficients?
> 
> With thanks,
> Ted.

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