[R] Force square crosstabulation
Hello list members, I'm looking for a way to force the results of a crosstabulation to be square - that is, to include 0 values. For example: table(letters[1:4],letters[c(1:3,3)]) yields: a b c a 1 0 0 b 0 1 0 c 0 0 1 d 0 0 1 I would like to return: a b c d a 1 0 0 0 b 0 1 0 0 c 0 0 1 0 d 0 0 1 0 Any suggestions? Thanks! -- Manuel A. Morales http://mutualism.williams.edu signature.asc Description: This is a digitally signed message part __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Force square crosstabulation
On 12/2/2006 8:26 PM, Manuel Morales wrote: Hello list members, I'm looking for a way to force the results of a crosstabulation to be square - that is, to include 0 values. For example: table(letters[1:4],letters[c(1:3,3)]) yields: a b c a 1 0 0 b 0 1 0 c 0 0 1 d 0 0 1 I would like to return: a b c d a 1 0 0 0 b 0 1 0 0 c 0 0 1 0 d 0 0 1 0 Any suggestions? Force the categories to be factors. fletters - factor(letters[1:4]) table(fletters[1:4],fletters[c(1:3,3)]) a b c d a 1 0 0 0 b 0 1 0 0 c 0 0 1 0 d 0 0 1 0 The idea is that when you take subsets of factors, the levels stay the same, and table uses those levels for its categories. Duncan Murdoch __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Force square crosstabulation
Use factors with specified levels. lev - letters[1:4] table(factor(letters[1:4], levels = lev), factor(letters[c(1:3,3)], levels = lev)) a b c d a 1 0 0 0 b 0 1 0 0 c 0 0 1 0 d 0 0 1 0 -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Manuel Morales Sent: Sunday, 3 December 2006 11:27 AM To: r-help@stat.math.ethz.ch Subject: [R] Force square crosstabulation Hello list members, I'm looking for a way to force the results of a crosstabulation to be square - that is, to include 0 values. For example: table(letters[1:4],letters[c(1:3,3)]) yields: a b c a 1 0 0 b 0 1 0 c 0 0 1 d 0 0 1 I would like to return: a b c d a 1 0 0 0 b 0 1 0 0 c 0 0 1 0 d 0 0 1 0 Any suggestions? Thanks! -- Manuel A. Morales http://mutualism.williams.edu __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
