[R] Troubles plotting lrm output in Design Library

[Frank E Harrell Jr]

Patrizio Frederic wrote:
> 2008/5/29 Frank E Harrell Jr <f.harrell at vanderbilt.edu>:
>> Patrizio Frederic wrote:
>>> dear Harrell,
>>> thank you for quick reply and suggestions. I still have the problem:
>>>
>>> library(Design)
>>> x   = rnorm(100)
>>> y   = runif(100)<(exp(x)/(1+exp(x)))
>>> y   = 0*y+1*y
>>> d   = datadist(x,y)
>>> options(datadist="d")
>>> fit = lrm(y~x)
>>> # works fine, but
>>> plot(fit) #produce the error message
>> I cannot reproduce the error on Linux R 2.7.0 using the same version of the
>> packages you are using.
>>
>> Frank
>>
> 
> just for the records, I solved the problem: in Windows R 2.7.0 one has to set:
> 
> d = datadist(x,y)
> .Options$datadist="d"
> 
> done that functions summary.Design, and plot.Design work fine.
> 
> PF
> 

Thanks for the solution.  But I wish someone would tell us why the 
solution makes sense.  If you have changed your R environment in any way 
from the defaults please let us know.

Frank

-- 
Frank E Harrell Jr   Professor and Chair           School of Medicine
                      Department of Biostatistics   Vanderbilt University