R help - Jul 2004 - areg.boot use of inverseTrans and ytype

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)

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

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





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@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]]

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]]
> 
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> 

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