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Re: st: string panelvar problem with xtset


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: string panelvar problem with xtset
Date   Fri, 8 Apr 2011 17:36:33 +0100

This is what -egen, group()- does, done more directly.

We can in fact boil it down

bysort string_id : gen num_id = _n == 1
replace num_id = sum(num_id)

Nick

On Fri, Apr 8, 2011 at 5:30 PM, Maarten buis <maartenbuis@yahoo.co.uk> wrote:
> --- On Fri, 8/4/11, 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?
>
> sort string_id
> by string_id : gen first = _n == 1
> gen num_id = sum(first)
> drop first
>
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