On Apr 23, 2010, at 11:26 AM, serdal ozusaglam wrote:
Dear R users,
I have a simple question (probably) but i couldnt how to find a
solution for that.
i am using 2 digit industry codes and 3 digit industry codes for my
model, and i need to create dummies for the industries. The case is
simple for the 2-digit industries since there are not that mcuh of
them, so i am creating my dummies as following
ind_2da<-(ind_2d==11)#for the 11th industry
ind_2dc<-(ind_2d==12)#for the 12th industry and so on so forth ...
then i directly put the dummy into the regression which works well.
but creating dummies for the 3-digit is rather complicated since
there are alot of sub-industries, for example:111,112,113...119 and
this is just for the 11th industry
so when i consider the codes continues till 40, it would be
exhausting to do it by hand.
so i was looking for the loop commands to do it faster but since i
am a newbie i got lost in it.
so is there some one who can help me for this problem?
Don't use dummies.
?factor
--
David Winsemius, MD
West Hartford, CT
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