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Re: st: string panelvar problem with xtset

From   Nick Cox <>
Subject   Re: st: string panelvar problem with xtset
Date   Fri, 8 Apr 2011 17:26:12 +0100

By "unique" I guess you mean "distinct". "Unique" means occurring once only.

-sencode- (SJ) will be bitten by the same limit as -encode-. It won't
solve your problem, even slowly.

I think you just need to use -egen, group()- and get integers. From
the sounds of it you will not want to wade through results for
individual panels anyway.


On Fri, Apr 8, 2011 at 5:20 PM, Dimitriy V. Masterov <> wrote:
> I am having trouble xtsetting my data. My panel variable is a
> concatenated 12 digit string block-group ID and a 4 digit store id.
> There are about 200,000 unique values.
> I cannot encode this variable because it has too many values. Sencode
> might be an option, but it has been chugging for some time.
> Any suggestions about how to solve this? Why does the panel variable
> have to be numeric?
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