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From |
"Jesper B. Sorensen" <sorensen@MIT.EDU> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: xtnbreg with weights |

Date |
Thu, 12 Dec 2002 10:59:44 -0500 |

At 12:20 PM 12/11/2002 -0800, you wrote:

I guess I wouldn't think of this as a weighting issue so much as an exposure issue. You have an incidence rate of crime that you are trying to model, but you observe counts of crimes, which depend on the size of the population that is exposed to the incidence rate. See for example the discussion of the exposure option in the manual discussion of _poisson_.Hello, We've been using the xtnbreg command to look at some crime data. Our unit of analysis is city*day. Some cities are much larger than others, however, so we would like to perform a specification in which we weight the cities by population. We would typically do this with the pweight option, but this is unavailable. iweights are possible but the standard errors are grossly incorrect. What can be done to compute the correct standard errors when using the iweight option?

//Jesper

Thanks, Lars Lars Lefgren Assistant Professor Economics Department Brigham Young University 130 FOB Provo, UT 84602-2363 (801) 422-5169 Lars Lefgren Assistant Professor Economics Department Brigham Young University 130 FOB Provo, UT 84602-2363 (801) 422-5169 * * 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/

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Jesper B. Sørensen Richard S. Leghorn (1939) Associate Professor of Strategic Management Sloan School of Management Massachusetts Institute of Technology E52-581 Cambridge, MA 02142 http://web.mit.edu/sorensen/www/ (617) 253 7945 -- voice (617) 253 2660 -- fax * * 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/

**References**:**st: xtnbreg with weights***From:*Lars Lefgren <l-lefgren@byu.edu>

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