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Re: st: If variable x contains variable y


From   <john.guzek@lshtm.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   Re: st: If variable x contains variable y
Date   Sun, 15 Jul 2012 17:28:56 +0100

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 john.guzek@lshtm.ac.uk:
> 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, "john.guzek@lshtm.ac.uk"  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:engel@coll.mpg.de
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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