[R] Assigning a larger number of levels to a factor that has fewer levels

From: Dimitri Liakhovitski <dimitri.liakhovitski_at_gmail.com>
Date: Thu, 07 Apr 2011 11:47:44 -0400


Hello!

I have larger and a smaller data frame with 1 factor in each - it's the same factor:

large.frame<-data.frame(myfactor=LETTERS[1:10]) small.frame<-data.frame(myfactor=LETTERS[c(9,7,5,3,1)]) levels(large.frame$myfactor)
levels(small.frame$myfactor)
table(large.frame$myfactor)
table(small.frame$myfactor)

myfactor has 10 levels in large.frame and 5 levels in small.frame. All 5 levels in small.frame are present in large.frame. How could I make levels(small.frame$myfactor) contain all the same levels as levels(large.frame$myfactor)?
In other words, I want table(small.frame$myfactor) to have the same number of entries as table(small.frame$myfactor) but with 5 zeros in it:
A B C D E F G J I J
1 0 1 0 1 0 1 0 1 0

Thank you very much for your suggestions!

-- 
Dimitri Liakhovitski
Ninah Consulting
www.ninah.com

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Received on Thu 07 Apr 2011 - 15:50:20 GMT

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