Hi. Here is one solution:
table(Donner$family)[Donner$family]
Andrija
On Fri, Apr 11, 2014 at 10:40 PM, Michael Friendly <frien...@yorku.ca>wrote:
> 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)
>
> Breen Donner Eddy FosdWolf Graves Keseberg McCutchen
> MurFosPik
> 9 14 4 4 10 4 3 12
> 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 Street Web: http://www.datavis.ca
> Toronto, ONT M3J 1P3 CANADA
>
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