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Keeping factors with zero occurrences in "table" output
3 messages · Achim Zeileis, Ravi Varadhan
On Wed, 20 Apr 2005 11:38:13 -0400 Ravi Varadhan wrote:
Dear R group, I have a data frame which contains data on preferences on 7 items (ranks 1 through 7) listed by each participant. I would like to tabulate this in a 7x7 table where the rows would be the items and the columns would be the number of times that item received a particular rank. I tried doing this by creating a matrix by "rbind"ing each vector obtained using "table" on each item. This, however, does not work because there are some items which didn't receive some of the ranks, so "table" does not list that item. Is there a way to force it to list the item and give a "0" to it? Or, is there a simpler way to solve this problem?
I think the cleanest way is to store the preferences as a "factor" and tell R at the creation of that factor what the levels are, i.e. preference <- factor(preference, levels = 1:7) Then calling table(preference) will also report categories with 0 observations. Z
Thanks for any help, Ravi. --------------------------------------------------------------------- ----- Ravi Varadhan, Ph.D. Assistant Professor, The Center on Aging and Health Division of Geriatric Medicine and Gerontology Johns Hopkins University Ph: (410) 502-2619 Fax: (410) 614-9625 Email: <mailto:rvaradhan at jhmi.edu> rvaradhan at jhmi.edu --------------------------------------------------------------------- ----- [[alternative HTML version deleted]]
______________________________________________ R-help at 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
Thanks very much to Achim Zeileis, Matt Weiner, and Andy Liaw for their solution. Declaring preferences as a "factor" worked! Best, Ravi. -------------------------------------------------------------------------- Ravi Varadhan, Ph.D. Assistant Professor, The Center on Aging and Health Division of Geriatric Medicine and Gerontology Johns Hopkins University Ph: (410) 502-2619 Fax: (410) 614-9625 Email: rvaradhan at jhmi.edu --------------------------------------------------------------------------
-----Original Message----- From: Achim Zeileis [mailto:Achim.Zeileis at wu-wien.ac.at] Sent: Wednesday, April 20, 2005 12:13 PM To: Ravi Varadhan Cc: r-help at stat.math.ethz.ch Subject: Re: [R] Keeping factors with zero occurrences in "table" output On Wed, 20 Apr 2005 11:38:13 -0400 Ravi Varadhan wrote:
Dear R group, I have a data frame which contains data on preferences on 7 items (ranks 1 through 7) listed by each participant. I would like to tabulate this in a 7x7 table where the rows would be the items and the columns would be the number of times that item received a particular rank. I tried doing this by creating a matrix by "rbind"ing each vector obtained using "table" on each item. This, however, does not work because there are some items which didn't receive some of the ranks, so "table" does not list that item. Is there a way to force it to list the item and give a "0" to it? Or, is there a simpler way to solve this problem?
I think the cleanest way is to store the preferences as a "factor" and tell R at the creation of that factor what the levels are, i.e. preference <- factor(preference, levels = 1:7) Then calling table(preference) will also report categories with 0 observations. Z
Thanks for any help, Ravi. --------------------------------------------------------------------- ----- Ravi Varadhan, Ph.D. Assistant Professor, The Center on Aging and Health Division of Geriatric Medicine and Gerontology Johns Hopkins University Ph: (410) 502-2619 Fax: (410) 614-9625 Email: <mailto:rvaradhan at jhmi.edu> rvaradhan at jhmi.edu --------------------------------------------------------------------- ----- [[alternative HTML version deleted]]
______________________________________________ R-help at 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