[R] Hmisc::rcorr on a 'data.frame'?

[Frank Harrell]

I don't see anything wrong with using as.matrix.  The documentation doesn't
say it will support a data frame.
Frank

Liviu Andronic wrote:
> 
> Dear all
> ?Hmisc::rcorr states that it takes as main argument "a numeric
> matrix". But is it normal that it fails in such an ugly way on a data
> frame? (See below.) If the function didn't attempt any conversion to a
> matrix, I would have expected it to state that in the error message
> that it didn't accept 'data.frame' objects in its input. Also, I
> vaguely remember having used in the past rcorr() on data frames.
> 
> Regards
> Liviu
> 
>> require(Hmisc)
>> rcorr(mtcars[ , 1:4])
> Error in storage.mode(x) <- if (.R.) "double" else "single" :
>   (list) object cannot be coerced to type 'double'
>> rcorr(as.matrix(mtcars[ , 1:4]))
>        mpg   cyl  disp    hp
> mpg   1.00 -0.85 -0.85 -0.78
> cyl  -0.85  1.00  0.90  0.83
> disp -0.85  0.90  1.00  0.79
> hp   -0.78  0.83  0.79  1.00
> 
> n= 32
> 
> 
> P
>      mpg cyl disp hp
> mpg       0   0    0
> cyl   0       0    0
> disp  0   0        0
> hp    0   0   0
> 
> 
> 
> 
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-----
Frank Harrell
Department of Biostatistics, Vanderbilt University
--
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