On Oct 20, 2011, at 8:22 PM, renee wrote:
Hello,
I am constructing a nomogram using cph and nomogram commands in Dr.
Harrell's Design/RMS package. The HR that I obtain for dichotomous and
categorical variables are identical to those that I obtain using STATA
stcox.
When posting to r-help it is advised to produce the code used. One
might guess that you were talking about output from summary(fit) but
that would be a guess.
However, the inter-quartile HR I obtain for continuous variables is
obviously different, since STATA gives me HR for each unit (year,
centimeter, etc) like coxph would give.
If you want HR's for single unit difference on the scale of the
measured units then this should produce those:
exp(coef(fit))
My question is if this will effect
the output of the nomogram. I'm assuming that nomogram is
constructed using
hazard between each unit rather than quartiles - is this true?
Yes.
Also, I've found that I do not need to create indicator variables
for my
categorical variables when I use cph. Is this also correct?
If they are factor classed variables, then that is correct.
I appreciate your feedback. Thank you.
~Renee
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--
David Winsemius, MD
West Hartford, CT
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