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Re: st: If variable x contains variable y
From
<[email protected]>
To
<[email protected]>
Subject
Re: st: If variable x contains variable y
Date
Sun, 15 Jul 2012 18:03:46 +0100
Hello,
Sorry, not quite. I'll try and explain it a slightly different way. I
was "x" to be 1 when the idno in the variable idno can also be found in
the variable mother_id. So each instance in "idno" where the "mother_id"
is not missing indicates a child, and a reference to the "idno" that
represents their mother. Therefore, the same number can appear in both
columns, but they will be on different rows. I want to know which idnos
in "idno" are mothers, therefore represented in "mother_id" as well. I
hope that makes more sense.
Thanks,
John
>>> Christoph Engel 15/07/12 5:43 PM >>>
John,
So you want your dummy to be 1 whenever "mother_id" is not missing,
right? Provided "mother_id" is a numeric variable, the following does
the trick
gen dummy = (mother_id < .)
Should mother_id be a string variable, the following syntax should work
gen dummy = (mother_id != "")
Best
Christoph Engel
Am 7/15/2012 6:31 PM, schrieb [email protected]:
> Hi,
>
>
> Sorry, this is getting somewhat embarrassing. Apparently the legible
> table is not in this chain, so I'll add it again.
>
>
> idhouse |idno |mother_id |x
> 1 |73664 |. |1
> 1 |73665 |. |.
> 1 |73666 |. |.
> 1 |73667 |73664 |.
> 1 |73668 |. |.
> 2 |94038 |. |.
> 2 |94039 |. |1
> 2 |94040 |. |.
> 2 |94041 |. |1
> 2 |94042 |. |.
> 2 |94043 |. |1
> 2 |94044 |94041 |.
> 2 |94045 |94039 |.
> 2 |94046 |. |1
> 2 |94047 |94046 |.
> 2 |94048 |94046 |.
> 2 |94049 |. |.
> 2 |94050 |. |.
> 2 |94051 |94043 |.
> 2 |94052 |. |.
>
>
> John
>>>> 15/07/12 5:30 PM>>>
> Hi,
>
>
> Sorry, I've not explained this very well. Hopefully the legible
version
> of the table will help, which I resent. So yes, "y" represents "idno",
> "z" represents "mother_id". I'm trying to make "x" to identify the
> mothers in "idno". So x=1 if "y" is found anywhere in "z".
>
>
> Thanks for you help.
> John
>
>
>>>> Christoph Engel 15/07/12 5:18 PM>>>
> John,
>
> It still is not fully clear to me what you want. I take it what you
> previously called "y" is variable "idno". You actually want a dummy
that
>
> is 1 if "idno" is in a certain range, and 0 otherwise. If that is what
> you are after, you can use
>
> gen dummy = (idno> 173664& idno< 294053)
>
> Actually for that purpose it is better that your variable idno is
> numeric.
>
> Hope that helps
>
> Christoph Engel
>
>
>
>
> Am 7/15/2012 5:52 PM, schrieb [email protected]:
>> Hi,
>>
>>
>> Thanks for your help. It's a bit more tricky than that, at least as
> far
>> as I can tell. I'll try and explain a little more clearly! So, as
> below,
>> I have household level and individual level identifiers. I
essentially
>> want to flag the mother's idno. So something along the lines of gen
> x=1
>> if idno=="any value in mother_id" to look like column x below.
Whether
>> column x read 1 or the corresponding idno is not important at this
>> stage. And I agree, these probably should be stored as string, it's
> not
>> my data!
>>
>>
>> idhouseidnomother_idx
>> 1736641
>> 173665
>> 173666
>> 17366773664
>> 173668
>> 294038
>> 2940391
>> 294040
>> 2940411
>> 294042
>> 2940431
>> 29404494041
>> 29404594039
>> 2940461
>> 29404794046
>> 29404894046
>> 294049
>> 294050
>> 29405194043
>> 294052
>>
>>
>>
>> Thanks for your help!
>> John
>>
>>
>>
>>>>> Christoph Engel 15/07/12 4:21 PM>>>
>> John,
>>
>> You will have to define the value of x if y does not fulfil your
>> condition, i.e. if it is not equal to z. Depending on your purposes
> you
>> might either want it to be a missing value, or some expression of x,
> say
>> 0. I would therefore start out
>>
>> gen x = .
>> replace x = y if y == z
>>
>> (note the "==" in the if clause)
>>
>> Best
>>
>> Christoph Engel
>>
>> Am 7/15/2012 4:59 PM, schrieb Steve Nakoneshny:
>>> John,
>>>
>>> At first glance, it would seem that -gen x = y if y = z- would serve
>> as a solution. Of course, this assumes that your I'd vars are
> numerical
>> and not string vars (which they probably should be stored as).
>>> Steve
>>>
>>> Sent via carrier pigeon
>>>
>>> On 2012-07-15, at 8:52 AM, "[email protected]" wrote:
>>>
>>>> Hello,
>>>>
>>>>
>>>> This is my first time using statalist, I hope I do this all
>> correctly!
>>>> I'm looking to create a variable x which is equal to y, but only if
>> the given value for y can be found in another variable, z. These are
> all
>> id numbers, so say y is a universal id and z is a mother's id,
telling
>> you the universal id of the mother in relation to the child.
>>>> For example:
>>>>
>>>>
>>>> yzx
>>>>
>>>>
>>>> 1..
>>>> 2.2
>>>> 3.3
>>>> 42.
>>>> 5..
>>>> 6..
>>>> 737
>>>> 8..
>>>> 9..
>>>> 107.
>>>>
>>>>
>>>> So I'm trying to figure out how to create x. Any help would be much
>> appreciated.
>>>> Thanks,
>>>> John
>>>>
>>>>
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>>>
>
--
_________________________________________________________________
Prof. Dr. Christoph Engel
Max-Planck-Institut zur
Erforschung von Gemeinschaftsgütern
Max Planck Institute for Research on Collective Goods
Kurt-Schumacher-Strasse 10
D 53113 Bonn
Tel. +49/228/91416-10
Fax +49/228/91416-11
e-mail:[email protected]
http://www.coll.mpg.de
http://www.coll.mpg.de/engel.html
http://ideas.repec.org/e/pen22.html
http://papers.ssrn.com/sol3/cf_dev/AbsByAuth.cfm?per_id=251559
_________________________________________________________________
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