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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