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From |
"Sayer, Bryan" <BSayer@s-3.com> |

To |
"'Marina Fe B. Durano '" <marina.f.durano@stud.man.ac.uk>, "'statalist@hsphsun2.harvard.edu '" <statalist@hsphsun2.harvard.edu> |

Subject |
st: RE: sample weights of 2 related surveys |

Date |
Wed, 26 Mar 2003 09:39:26 -0500 |

Sampling weights are generally designed to reflect the composition of a specific population. If those two (or more) populations are mutually exclusive but combined represent some useful population then you just need to concatenate the two datasets, being mindful that the scale of the weights remains the same. But if the populations overlap, then you would need to rescale the weights of the overlap portion, preferably along the same categories that the original weights were created. But this specific instance sounds like they are not designed to be analyzed together. Otherwise, I think they would already be joined. Possibly the two sets of questions are very different. In which case you simply analyze them seperatly. Bryan Sayer Statistician, SSS Inc. -----Original Message----- From: Marina Fe B. Durano To: statalist@hsphsun2.harvard.edu Sent: 3/26/03 7:46 AM Subject: st: sample weights of 2 related surveys Hello, all! I have a question on what to do with the sample weights when combining cases of two related surveys. Situation: A labor force survey was conducted. Each household was asked wether a person left for abroad in the last 5 years. If yes, another set of questions was asked. There are two datasets: one on the domestic labor force and the second on the labor force that went abroad. Both datasets use the same household sampling frame. Cases for each dataset have sample weights based on population density and adjusted for enumeration areas that were not enumerated, non-interview households, and population projection. The two datasets are treated separately with their own set of sample weights. Question: If I combine the two datasets to get total labor force in and out of country, how do i recompute the sample weights? thanks, marina Marina Fe B. Durano Dover St. Building, Room N.3.10 School of Economic Studies University of Manchester Manchester M13 9PL United Kingdom Tel: +44(161)2754516 * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

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