Hello,
using the Design library, and the following command (from the Harrell's book, example at Ch.20):

dd <- datadist(rx, age, wt, pf, pf.coded, heart, map, hg, sz, sg, ap, bm)
options(datadist=='dd')

I get the following error:

Error in datadist == "dd" : comparison (1) possible only for atomic data or list

What does it means?

thank you,

giulia



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