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