Edward wrote:
I would like to compute a risk difference, instead of the default risk
ratio, using the -cs- command in epitab. However, when I try to run
commands like
gen ones = 1
cs y x, by(a b c) standard(ones) rd
Stata 9.0 returns a error of "invalid sytax" number 198. The same
command without "rd" (meaning the default risk ratio) works fine.
--------------------------------------------
I could reproduce the problem with an updated Stata 9.1.
But you could trick Stata into believing that you have only one
stratification variable:
. egen abc=group(a b c) , label
. cs y x , by(abc) standard(ones) rd
Then it works - but the trick ought not be necessary. Another
possibility is to use -binreg-.
Hope this helps.
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: +45 8942 6090
Home: +45 8693 7796
Email: [email protected]
__________________________________________
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