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From |
"Svend Juul" <SJ@SOCI.AU.DK> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: calculating SMRs, examples? |

Date |
Tue, 13 Sep 2005 21:17:23 +0200 |

Raoul asked: Are there any good websites or books out there that explain in detail how to calculate a standardized mortality ratio (SMR) with poisson regression using external rates? I find that the STATA manuals do not contain a lot of information regarding this topic, any suggestions? ---- I don't know how much you know, so this may be too basic: Indirect standardization to obtain SMRs may be performed by Stata in several ways, among others: -istdize- (see [R] dstdize) -strate- (see [ST] strate) -poisson- (see [R] poisson) I found -istdize- somewhat complex to work with; it requires quite a bit of date preparation, and some of the requirements don't seem very logical to me. I found -strate- friendlier and more logical. It requires that you: 1. -stset- 2. -stsplit- the observations in age bands corresponding to the age groups in your reference dataset (reference population mortality rates) 3. -merge- the dataset and the reference file by age group. Now, each observation represents a person-ageband with time at risk (pyrs = _t - _t0), death (_d), and reference mortality rate (e.g. mrate): . strate , smr(mrate) You may proceed from here to -poisson-; it requires the expected number of deaths: . gen edeaths = pyrs*mrate . poisson _d exposure(edeaths) , irr Was this what you needed? Svend ________________________________________________________ Svend Juul Institut for Folkesundhed, Afdeling for Epidemiologi (Institute of Public Health, Department of Epidemiology) Vennelyst Boulevard 6 DK-8000 Aarhus C, Denmark Phone, work: +45 8942 6090 Phone, home: +45 8693 7796 Fax: +45 8613 1580 E-mail: sj@soci.au.dk _________________________________________________________ * * 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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