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Re: st: ssmenu, stcox and sample size estimates


From   Simon <scmoore.lists@googlemail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: ssmenu, stcox and sample size estimates
Date   Wed, 18 Aug 2010 15:45:06 +0100

<>

I've looked and under >user I have >Data, >Graphics and >Statistics each pointing to a blank sub menu

Simon


On 18/08/2010 15:37, Richard Goldstein wrote:
it should be one of the items under "User" in the menu bar -- have you
checked there?

Rich

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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