One solution is to create a variable containing a random, sort by this
variable and mark the first 40 cases, The following code shows one
way to do this, but it can be made shorter.
Best,
Alan
/***********************************
sysuse auto, clear
gen id=_n
set seed 3182009
gen takesmp=runiform()
sort takesmp
gen takeflag=0
replace takeflag=1 if _n<=40
sort id
list id takesmp takeflag
drop id takesmp
**********************************/
On Wed, Mar 18, 2009 at 8:18 AM, moleps islon <[email protected]> wrote:
> Dear statalisters,
> 2 questions:
> -Is there an easy way to draw 40 random patients from a sample of 450
> and generate a dummy variable containg 0 "not drawn" 1"drawn". E.g a
> command like : draw variable 40, gen(dummy)
> -How can i compare an exposed group to a non-exposed group when I have
> the number of cancer incidents in the exposed group, follow-up time
> and only adjusted incidence rates for the non-exposed group ? E.g 11
> cancers in 217 exposed subjects with a total follow-up time of 2500
> years compared to the adjusted incidence rate of 6/100000.
>
> Regards
>
> Moleps
> *
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>
*
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