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Re: st: Generating block randomation schedule using Stata


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Generating block randomation schedule using Stata
Date   Wed, 27 Aug 2003 18:37:43 +0100

Rolf Klemm

> I want to generate a randomization schedule for a study with 2 arms
> for a sample size of 800 with a block size of 8, or 100 blocks of 8.
> Is there a way to do this in Stata?

If I understand this correctly, you want to set up
a repeated list of identifiers and then shuffle it.
This illustrates some technique:

. set obs 800
. egen id = seq(), to(8)
. egen block = seq(), block(8)
. * or choose a different pie
. set seed 314159
. gen random = uniform()
. sort block random
. list block id

An alternative to -egen, seq()- is -egen, repeat()- on SSC.
That will repeat sequences other than contiguous integers.

Nick
n.j.cox@durham.ac.uk

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