Wednesday, January 04, 2006

st: Re: solving equations with stata

gen weight=res^-2 sum weight, meanonly replace weight=weight*_N/r(sum)

Michael Blasnik michael.blasnik@verizon.net

----- Original Message ----- From: "Gianfranco Spiteri" <Gianfranco.Spiteri@hpa.org.uk> To: <statalist@hsphsun2.harvard.edu> Sent: Wednesday, January 04, 2006 11:34 AM Subject: st: solving equations with stata

> Hi, > I am trying to perform a downweighting process for a dataset I am working > on > (for an outbreak detection system of infectious diseases based on the > Farrington method). As part of the process I have got to a point were I > have > a list of residuals (res). I need to create weights for the original data > based on these residuals using the following formulas: > weight = a * res ^ -2 > where a is a constant such that: > sum of all weights = n > > where n is the number of observations (n is 35 or less with this method) > I'm sure there is a relatively straight forward way of doing this in > stata, > but I cant seem to find it. Can anyone help me out, > thanks > Gianfranco

* * 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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