[R] Odds ratios from lrm plot
Frank Harrell
f.harrell at vanderbilt.edu
Sat Nov 12 03:51:47 CET 2011
The Design package is obsolete. Use its replacement rms - see
http://biostat.mc.vanderbilt.edu/Rrms. Use something like the following to
reproduce what you already have:
To plot odds ratios against a specific value of x2 and at a specific x1,
type ?contrast.rms to see examples.
Frank
RD235 wrote:
>
> The code
>
> library(Design)
> f <- lrm(y~x1+x2+x1*x2, data=data)
> plot(f)
>
> produces a plot of log odds vs x2 with 0.95 confidence intervals. How do I
> get a plot of odds ratios vs x2 instead?
>
> Thanks
>
-----
Frank Harrell
Department of Biostatistics, Vanderbilt University
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