[R] adding a frequency variable to a data frame
I'm sure this is pretty simple, but it's Friday afternoon, and I just don't see it... In a data frame with a categorical/character factor, I want to add another column giving, for each observation, the frequency of that factor level. An example, where the variable of interest is family: data(Donner, package=vcdExtra) str(Donner) 'data.frame': 90 obs. of 5 variables: $ family : Factor w/ 10 levels Breen,Donner,..: 9 1 1 1 1 1 1 1 1 1 ... $ age : int 23 13 1 5 14 40 51 9 3 8 ... $ sex : Factor w/ 2 levels Female,Male: 2 2 1 2 2 1 2 2 2 2 ... $ survived: int 0 1 1 1 1 1 1 1 1 1 ... $ death : POSIXct, format: 1846-12-29 NA ... table(Donner$family) BreenDonner Eddy FosdWolfGraves Keseberg McCutchen MurFosPik 914 4 410 4 312 Other Reed 23 7 Here, I want to create a new variable, family.size, where all the Breens have 9, the Donners, 14, and so on... -- Michael Friendly Email: friendly AT yorku DOT ca Professor, Psychology Dept. Chair, Quantitative Methods York University Voice: 416 736-2100 x66249 Fax: 416 736-5814 4700 Keele StreetWeb: http://www.datavis.ca Toronto, ONT M3J 1P3 CANADA __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] adding a frequency variable to a data frame
Hi. Here is one solution: table(Donner$family)[Donner$family] Andrija On Fri, Apr 11, 2014 at 10:40 PM, Michael Friendly frien...@yorku.cawrote: I'm sure this is pretty simple, but it's Friday afternoon, and I just don't see it... In a data frame with a categorical/character factor, I want to add another column giving, for each observation, the frequency of that factor level. An example, where the variable of interest is family: data(Donner, package=vcdExtra) str(Donner) 'data.frame': 90 obs. of 5 variables: $ family : Factor w/ 10 levels Breen,Donner,..: 9 1 1 1 1 1 1 1 1 1 ... $ age : int 23 13 1 5 14 40 51 9 3 8 ... $ sex : Factor w/ 2 levels Female,Male: 2 2 1 2 2 1 2 2 2 2 ... $ survived: int 0 1 1 1 1 1 1 1 1 1 ... $ death : POSIXct, format: 1846-12-29 NA ... table(Donner$family) BreenDonner Eddy FosdWolfGraves Keseberg McCutchen MurFosPik 914 4 410 4 312 Other Reed 23 7 Here, I want to create a new variable, family.size, where all the Breens have 9, the Donners, 14, and so on... -- Michael Friendly Email: friendly AT yorku DOT ca Professor, Psychology Dept. Chair, Quantitative Methods York University Voice: 416 736-2100 x66249 Fax: 416 736-5814 4700 Keele StreetWeb: http://www.datavis.ca Toronto, ONT M3J 1P3 CANADA __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/ posting-guide.html and provide commented, minimal, self-contained, reproducible code. [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] adding a frequency variable to a data frame
another: ave(as.numeric(Donner$family), Donner$family, FUN=length) On Fri, Apr 11, 2014 at 10:51 PM, Andrija Djurovic djandr...@gmail.comwrote: Hi. Here is one solution: table(Donner$family)[Donner$family] Andrija On Fri, Apr 11, 2014 at 10:40 PM, Michael Friendly frien...@yorku.cawrote: I'm sure this is pretty simple, but it's Friday afternoon, and I just don't see it... In a data frame with a categorical/character factor, I want to add another column giving, for each observation, the frequency of that factor level. An example, where the variable of interest is family: data(Donner, package=vcdExtra) str(Donner) 'data.frame': 90 obs. of 5 variables: $ family : Factor w/ 10 levels Breen,Donner,..: 9 1 1 1 1 1 1 1 1 1 ... $ age : int 23 13 1 5 14 40 51 9 3 8 ... $ sex : Factor w/ 2 levels Female,Male: 2 2 1 2 2 1 2 2 2 2 ... $ survived: int 0 1 1 1 1 1 1 1 1 1 ... $ death : POSIXct, format: 1846-12-29 NA ... table(Donner$family) BreenDonner Eddy FosdWolfGraves Keseberg McCutchen MurFosPik 914 4 410 4 312 Other Reed 23 7 Here, I want to create a new variable, family.size, where all the Breens have 9, the Donners, 14, and so on... -- Michael Friendly Email: friendly AT yorku DOT ca Professor, Psychology Dept. Chair, Quantitative Methods York University Voice: 416 736-2100 x66249 Fax: 416 736-5814 4700 Keele StreetWeb: http://www.datavis.ca Toronto, ONT M3J 1P3 CANADA __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/ posting-guide.html and provide commented, minimal, self-contained, reproducible code. [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] adding a frequency variable to a data frame
Bingo! That's exactly the idiom I was looking for. Thanks, Andrija. -Michael On 4/11/2014 4:57 PM, Andrija Djurovic wrote: another: ave(as.numeric(Donner$family), Donner$family, FUN=length) -- Michael Friendly Email: friendly AT yorku DOT ca Professor, Psychology Dept. Chair, Quantitative Methods York University Voice: 416 736-2100 x66249 Fax: 416 736-5814 4700 Keele StreetWeb: http://www.datavis.ca Toronto, ONT M3J 1P3 CANADA __ R-help@r-project.org 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.
