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Re: st: Change variable


From   Robson Glasscock <glasscockrc@vcu.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Change variable
Date   Sat, 10 Sep 2011 11:53:07 -0400

So File 1 is a panel data set that records each individual's
educational level over time? If that is the case, and if File 2 is
also panel data, then a 1:1 merge based on x1(unique id) and x3(time
period) could be done.

If File 2 is not panel data, then you're looking at a m:1 merge based
on x1(unique id).

If this doesn't solve the problem, I think you should include an
example of the observations in each of your files on your next post.
I'm still struggling a bit to picture the contents of your files.

On Sat, Sep 10, 2011 at 9:20 AM, Ay <yuniphone@yahoo.co.id> wrote:
> Dear Robson,
>
> Thank you for replying.
>
> Actually,
> File 1:
> x1 (unique id)
> x2 (educational level)
>
> File 2
> x1 (unique id)
>
>
> In file 2, x1 & x2 together are unique id. All of the variables are in strings.
>
> I could not merge file1 and file 2 since x2 is the educational level in which an individual would have more than 1 level/type.
>
> Thank you,
>
> Yun
>
>
>
>
>
>
> On 10 Sep 2011, at 22:56, Robson Glasscock <glasscockrc@vcu.edu> wrote:
>
>> I'm having a hard time understanding the structure of your "first
>> file" and your "second file. Do your files looks like this:
>>
>> File 1:
>> x1
>> (unique id + educational level)
>>
>> File 2:
>> x1
>> (unique id)
>>
>> so that File 1 contains a concatenated variable?
>>
>> If File 1 has one variable, x1, that is concatenated, then I don't
>> think you need to merge the files together to get what you want. You
>> would just need to split x1(unique id + educational level) into
>> x1(unique id) and x2(educational level). The substr function may be
>> used to do this.
>>
>> -help substr-
>>
>> best,
>> Robson Glasscock
>>
>> On Fri, Sep 9, 2011 at 5:27 PM, Ay <yuniphone@yahoo.co.id> wrote:
>>>
>>> I am using stata 11.0
>>>
>>> How can i generate or change a variable that contains for instance, educational level or father and mother as 'Type'?
>>> The variables are in strings format.
>>>
>>> The reason i am asking this question is that, i want to merge these 'type' variable (var B) with other variable.
>>> I could not do this since the second file only has variable A as individual id variable. While in the first file, it has var A and var B ('type' or level variable) as unique Id.
>>>
>>> If anyone knows other ways besides generating the type variable before merging, I really appreciate it.
>>>
>>> Variable a
>>> 1,2,1,1,2,3,3
>>>
>>> Variable b(type)
>>> A,A,B,C,B,C,A
>>>
>>> Many thanks.
>>>
>>> Regards,
>>>
>>> Yun
>>>
>>>
>>>
>>>
>>>
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