[julia-users] how to convert several DataFrame columns to type PooledDataArray for GLM regression

[Florian Oswald]

Hi,

say I want to use the GLM package to run a regression that contains several 
categorical variables. My understanding is that I need the equivalent of an 
R factor, which is a PooledDataArray. Suppose I take this dataset

using RDatasets

*data = dataset("Ecdat","Benefits")*

and I want columns 6-14 as PooledDataArray

I tried

data[,:Sex] = convert(PooledDataArray,data[,:Sex])
and
pool!(data[,:Sex])  # I can see that this needs a second column with the 
numeric code

thanks!