[R] Datadist error

From: Sander van Kuijk <sander1981_at_gmail.com>
Date: Tue, 12 Apr 2011 16:38:20 +0200


Dear all,

I have performed a simple logistic regression using the lrm function from the Design library. Now I want to plot the summary, or make a nomogram. I keep getting a datadist error: options(datadist= m.full ) not created with datadist.
I have tried to specify datadist beforhand (although I don't know why it should be done):

ddist<-datadist(d)                ##where d is my dataset
options(datadist="ddist")

This doesn't work. It only works when I convert my original dataset to datadistL

d<-datadist(d)
options(datadist="d")

After this I can perform all the diagnostics and make a nomogram. However, my dataset 'd' is now completely useless, and I have to run the code to read in my data again and again to perform actions that are not related to datadist. Please let me know what I am overlooking.

This is some more of the code:

m.full<-lrm(event~pa+pb+pc, x=TRUE, y=TRUE, data=d) stats<-m.full$stats
hshrink<-(stats["Model L.R."]-stats["d.f."])/stats["Model L.R."] hshrink
ddist<-datadist(d)
options(datadist="ddist")

par(mfrow=c(2,2))

plot(m.fulldesign)                         ##Error I described
f.sum<-summary(m.fulldesign)      ##Error I described
nomogram(m.full)                        ##Error I described


Best regards,
Sander van Kuijk

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