Suppose I have the following dataframe called test:
test-data.frame(year=rep(1990:2003,5),id=gl(5,length(1990:2003)),eif=as.vector(sapply(1:5,function(z){a-rep(0,length(1990:2003));a[sample(1:length(1990:2003),sample(1:2,1))]-1;a})))
year id eif
1990 1 0
1991 1 0
1992 1 0
2000 1 1
: Monday, March 01, 2010 2:03 PM
To: 'r-help@r-project.org'
Subject: [R] Generating variable from 2 others in dataframe
Suppose I have the following dataframe called test:
test-data.frame(year=rep(1990:2003,5),id=gl(5,length(1990:2003)),eif=as.vec
tor(sapply(1:5,function(z){a-rep(0,length(1990:2003
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