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Re: st: Change variable


From   Ay <yuniphone@yahoo.co.id>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Change variable
Date   Thu, 15 Sep 2011 23:25:10 +1000

Dear Robson,

Thank you for replying.
I've tried m:1, it showed that ...is not unique id. 
When i check it using isid, file1 includes educlevel as unique id. Hence, there would be the same child with different educlevel. So, this child has 2 obs in the file1.
Actually, the child (id2) does not mean the number of child in the household, but number of respondent.
I have searched online about this, but still does not get an answer.

Thank you,

Yun




On 15 Sep 2011, at 22:06, Robson Glasscock <glasscockrc@vcu.edu> wrote:

> Hi Ay,
> 
> No need for an apology. This is a m:1 merge using household(id1) and
> child(id2).
> 
> Sort File 1 on household and child. Save it.
> Sort File 2 on household. Save it.
> 
> Go into file_1 and type:
> 
> merge m:1 household child using File_2.dta
> 
> Note that it looks to me from the data you provided that household 2
> has child 4 and child 3 in File 1, but File 2 only has child 1. Also,
> household 3 in File 1 has child 5, but household 3 in File 2 has child
> 2. These will show up as observations where _merge != 3 after you
> merge the files.
> 
> best,
> Robson Glasscock
> 
> On Thu, Sep 15, 2011 at 6:02 AM, Ay <yuniphone@yahoo.co.id> wrote:
>> Dear Robson,
>> 
>> My apologize about my unclear question.
>> 
>> I try to list the variables and data in rows rather than in colomn.
>> 
>> File 1
>> Household(id1)->
>> 1, 1, 1, 2, 2, 2, 3, ...
>> 
>> Child(id2)->
>> 2, 2, 3, 4, 3, 3, 5, ...
>> 
>> Educlevel->
>> 2, 1, 1, 2, 2, 1, 1, ...
>> 
>> X3(schooltype)->
>> a, b, a, b, a, a, b, ...
>> 
>> X4(repetition)
>> 2, 2, 2, 2, 2, 2, 2, ...
>> 
>> Educlevel in strings.
>> Educlevel=1 is primary school.
>> Educlevel=2 is secondary level.
>> A child may have secondary level and thus have records for his primary level along with other variables in file1.
>> 
>> 
>> File 2
>> Household(id1)->
>> 1, 2, 3, ...
>> 
>> Child(id2)->
>> 3, 1, 2, ...
>> 
>> X3(ethnicity)
>> 1, 3, 2,  ...
>> 
>> X4(livings)->
>> 1, 2, 2,  ...
>> 
>> In file 2 only single obs.
>> 
>> I hope this is clearer.
>> 
>> Thank you.
>> 
>> Regards,
>> 
>> Yun
>> 
>> 
>> On 11 Sep 2011, at 01:53, Robson Glasscock <glasscockrc@vcu.edu> wrote:
>> 
>>> 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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