[R] back transformation from avas

[Frank E Harrell Jr]

Anne wrote:
> Hello R helpers!
>  I'm using the avas function form package acepack (called from areg.boot package Hmisc)  to estimate automatically transformations of predictors (in this case monotonous) and response.
> 
> Well, it seems to work quite well, but I have 3 basic questions:
> - which set of basis functions is used in this procedure?
> - how do I back transform my estimate (y hat ) to the originasl scale?

Please read docs for areg.boot.  predict.areg.boot does this already, 
using reverse linear interpolation.

> - is there a closed analytical description of the model used? If so, how do I get it?

No

Frank

> 
> Thanks a lot
> Anne
> 
> 
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> Anne Piotet
>  Email: anne.piotet at m-td.com
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-- 
Frank E Harrell Jr   Professor and Chair           School of Medicine
                      Department of Biostatistics   Vanderbilt University