[R] Condition to factor (easy to remember)

Dieter Menne dieter.menne at menne-biomed.de
Thu Oct 1 13:47:56 CEST 2009

Douglas Bates-2 wrote:
> On Wed, Sep 30, 2009 at 2:42 PM, Douglas Bates <bates at stat.wisc.edu>
> wrote:
> And besides, Frank Harrell will soon be weighing in to tell you why
> you shouldn't dichotomize in the first place.

Subjects in this study received a 20 ml infusion of Kirsch (40%, Swiss
Brand) at t=10 minutes, therefore the second interval should read "Prost"
instead of "Post". Even Frank would admit this is a valid dichotomization.


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