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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 17:10:59 +0100 |

Hi again, Sorry, I forget that email can't handle tab! 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! 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 |. |. 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 >> >> >> * >> * 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/ * * 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/

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