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From |
Christoph Engel <engel@coll.mpg.de> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: If variable x contains variable y |

Date |
Sun, 15 Jul 2012 18:41:44 +0200 |

John,

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 john.guzek@lshtm.ac.uk:

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 |. |. John15/07/12 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. JohnChristoph 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 asfaras I can tell. I'll try and explain a little more clearly! So, asbelow,I have household level and individual level identifiers. I essentially want to flag the mother's idno. So something along the lines of genx=1if 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'snotmy 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! JohnChristoph 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 purposesyoumight either want it to be a missing value, or some expression of x,say0. 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 serveas a solution. Of course, this assumes that your I'd vars arenumericaland 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 allcorrectly!I'm looking to create a variable x which is equal to y, but only ifthe given value for y can be found in another variable, z. These areallid 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 muchappreciated.Thanks, John * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/* * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

-- _________________________________________________________________ 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 _________________________________________________________________ * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**Re: st: If variable x contains variable y***From:*<john.guzek@lshtm.ac.uk>

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