[R] areg.boot use of inverseTrans and ytype

[Frank E Harrell Jr]

Anne wrote:
> Hi R helpers!
> 
> I'm still a bit ( alot) confused by the use of "inverseTrans" and "ytype" in areg.boot (Hmisc): What I want to do seems very simple, but I do not get the result I want:
> plot the predicted values in the original scale. (I did not understand the documentation, sorry!)
> 
> 
> for instance the following code
> f<-areg.boot(Pe[here]~monotone(t[here])+monotone(v[here])+I(Pa[here]-Pm[here])+......,B=100)

In models don't subset every variable.  Use subset=here.

> 
> f.origScale<-Function(f,ytype="inverse")                         #  works up to here OK, back to original Pe scale
> 
> 
> 
>  Now if use predict() to make prediction for given input values , how do I transform the result back into the original response scale?
> 
> (in the documentation:
> 
>  A 'predict' method computes predicted
>      values on the original or transformed response scale, or a matrix
>      of transformed predictors)
> 
> 
> 
> so I tried 
> 
> y.predicted<-predict(f,data2predict, type='inverse')   #result is in transformed scale
> 
> y.predicted<-predict(f,data2predict, type='fitted',scale="original")....without success


y.predicted <- predict(f, statistic='fitted')
# similar to statistic='median'

> 
> (I did not find the documentation for the predict method of areg.boot)

It's there.  Do ?areg.boot and you'll see it.

Frank

> 
> 
> 
> 
> 
> as the inverse transformation of response obtained by areg.boot is not analytical, I do not see how I can use inverseTrans 
> 
> 
> 
> .
> 
> 
> 
> Thank for any help
> 
> 
> 
> Anne
> 
> 
> 
> ----------------------------------------------------
> Anne Piotet
> Tel: +41 79 359 83 32 (mobile)
> Email: anne.piotet at m-td.com
> ---------------------------------------------------
> M-TD Modelling and Technology Development
> PSE-C
> CH-1015 Lausanne
> Switzerland
> Tel: +41 21 693 83 98
> Fax: +41 21 646 41 33
> --------------------------------------------------
>  
> 	[[alternative HTML version deleted]]
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://www.stat.math.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
> 


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