You might also look at the Hmisc package's score.binary function.
Frank
Daniel Nordlund wrote:
Thanks to Ehud Cohen and William Dunlap for their assistance. Both solutions
worked and were helpful.
Dan
Daniel Nordlund
Bothell, WA USA
-----Original Message-----
From: ehud cohen [mailto:ehudco.l...@gmail.com]
Sent: Friday, December 18, 2009 1:05 PM
To: Daniel Nordlund
Cc: r-help@r-project.org
Subject: Re: [R] how to combine multiple indicator variables in a single
factor
you can try:
df$f<-names(df)[apply(df,1,function(x) which(x==1))]
Ehud
On Fri, Dec 18, 2009 at 10:48 PM, Daniel Nordlund
<djnordl...@verizon.net> wrote:
Say I have a dataframe like this:
df <- data.frame(cbind(c(1,0,0,1),c(0,1,0,0),c(0,0,1,0)))
names(df) <- c('a','b','c')
I would like to create a factor in a new column, where the factor values
are taken from the column names, like this:
df2
a b c f
1 1 0 0 a
2 0 1 0 b
3 0 0 1 c
4 1 0 0 a
How would I do this? Thanks,
Dan
Daniel Nordlund
Bothell, WA USA
--
Frank E Harrell Jr Professor and Chair School of Medicine
Department of Biostatistics Vanderbilt University
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