I have a big data set that includes character variables of many different
values. I'm trying to read the data as big.matrix and then use
biglm.big.matrix to build linear models. However, since big.matrix will
convert all character vectors to factors and the character labels will be
lost, I decided to create a lookup table outside of R for my character
columns and use numbers to represent different levels for R. However, I do
not know how to tell big.matrix these columns should be considered factors
instead of numerics. Please help. thanks.
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