On 2010-07-02 7:36, Frank E Harrell Jr wrote:
ols has always been fussy about this. And don't use poly; use pol with
rms/Design.
Frank
Quite right; I did mean pol(), not poly().
Darn fingers sometimes just won't obey.
-Peter Ehlers
On 07/02/2010 07:28 AM, Peter Ehlers wrote:
Otto,
The current version of ols() is fairly fussy about the
way the predictors are used. I'm not fond of the I()
construction anyway and so I would either use poly()
or define a new predictor as you suggest in your
original post.
See also this thread:
https://stat.ethz.ch/pipermail/r-help/2010-June/241587.html
-Peter Ehlers
[snip]
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