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Re: st: ssmenu, stcox and sample size estimates

From   Richard Goldstein <>
Subject   Re: st: ssmenu, stcox and sample size estimates
Date   Wed, 18 Aug 2010 10:37:08 -0400

it should be one of the items under "User" in the menu bar -- have you
checked there?


On 8/18/10 10:33 AM, Simon wrote:
> <>
> I have successfully installed Royston & Babiker's ssmenu (SJ2-2 st0013.
>  A menu-driven facility for complex sample size) and following the help
> file ran -ssmenu on- to which I received "Study size menu on.  The
> menubar has been changed." However, I cannot see any change in the menu
> bar. Is this compatible with Stata 11MP? If not, could someone suggest
> an alternative?
> I have data from a pilot RCT, the unit of allocation is premises and
> each premises is subject to multiple failures. Data is described at the
> daily level with half of the premises (n=16) receiving the intervention
> half way through, the other half not. So I have run:
> stset date, fail(fail) exit(time .) id(premises) enter(date0)
> xi: stcox intervention,  efron robust schoenfeld(sch*) scaledsch(sca*)
> cluster(loc)
> And from this I would like to estimate the number of premises required
> in the full study.
> Wishing you well
> Simon
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