Hi Shane,
An alternative is:
cat<-as.factor(c(1,1,3,2,4))
outer(cat, levels(cat), "==")+0
Cheers,
Pablo
----- Original Message -----
From: "andrija djurovic" <djandr...@gmail.com>
To: "Shane Phillips" <sphill...@lexington1.net>
Cc: <r-help@r-project.org>
Sent: Tuesday, April 12, 2011 2:32 PM
Subject: Re: [R] Converting a categorical variable to multiple
dichotemousvariables
hi:
here is one solution:
cat<-as.factor(c(1,1,3,2,4))
model.matrix(~cat-1,cat)
cbind(cat,model.matrix(~cat-1,cat))
Andrija
On Tue, Apr 12, 2011 at 2:17 PM, Shane Phillips
<sphill...@lexington1.net>wrote:
I have a categorical variable in a dataframe similar to the following...
cat
1
1
3
2
4
I need to convert it to 4 dichotemous variables for each observations
like...
cat1 cat2 cat3 cat4
1 0 0 0
1 0 0 0
0 0 1 0
0 1 0 0
0 0 0 1
Thanks in advance!
Shane
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and provide commented, minimal, self-contained, reproducible code.
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
