State of categorical variables

[Benjamin Deonovic]

How is the state of categorical variables (or "factors" as they are called in R) going? I know The current implementation is PooledDataArrays in DataFrames. I was wondering what holes still exist, etc. Will categorical variables/factors be possible outside of a data frame? How about the famous R table function? I believe that is still missing.

[Milan Bouchet-Valat]

PooledDataArrays are perfectly usable outside of DataFrames.

John experimented with a replacement, but I'm not sure what's the
status of his work at the moment:
https://github.com/johnmyleswhite/CategoricalData.jl


Regarding an equivalent of table(), see
http://statsbasejl.readthedocs.org/en/latest/counts.html

as well as this small package of mine:
https://github.com/nalimilan/FreqTables.jl

I doesn't work currently with 0.4, but that should be easy to fix (I'll
do it soon).


Regards

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[Benjamin Deonovic]

Counts doesn't give the same output as table because you have to provide counts with the levels of the variables and you can only provide "ranges" as levels. Thanks for the other suggestions.

[Douglas Bates]

See StatsBase::countmap for generating a table.

[Benjamin Deonovic]

Countmap doesn't do cross-tabulation of two variables e.g. R's table(x,y).