[R] datadist options error, DESIGN library

[Frank E Harrell Jr]

Giulia Barbati wrote:
> 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')

That command doesn't appear in the book.  The == should be a single =

Frank

> 
> 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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-- 
Frank E Harrell Jr   Professor and Chair           School of Medicine
                      Department of Biostatistics   Vanderbilt University