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Re: st: RE: Generating block randomation schedule using Stata

From   Philip Ryan <>
Subject   Re: st: RE: Generating block randomation schedule using Stata
Date   Thu, 28 Aug 2003 09:12:47 +0930

I wrote a program called -ralloc.ado- that went through several versions in the STB. The latest version, updated after STB-54, resides on the SSC server.

net describe ralloc

'RALLOC': module to design randomized controlled trials


ralloc provides a sequence of treatments randomly permuted in
blocks of constant or varying size. If not constant, the size
and order of the blocks are also random. Allocation may be
stratified on one or more variables. Randomisation may also
proceed simultaneously on 2 factors: 2x2, 2x3, 3x2, 3x3, 2x4,
4x2, 3x4 and 4x3 factorial designs are supported. ralloc will
also handle a 2x2 crossover design with or without a
supplementary 3rd period as either a "switchback" or "extra
period" design (Jones and Kenward 1989). A typical use of ralloc
is in a randomised controlled clinical trial (RCT), and, in
particular, in a multicentred trial where balance in treatment
allocations may be desirable within centre and other defined
strata. This is version 3.2.5 of the software, updated from the
version published in STB-54. A test data file is included in


-----Original Message-----
From: Rolf Klemm []
Sent: Wednesday, August 27, 2003 11:54 AM
Subject: st: Generating block randomation schedule using Stata

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?

Philip Ryan
Associate Professor,
Department of Public Health
University of Adelaide 5005
South Australia
tel 61 8 8303 3570
fax 61 8 8223 4075
CRICOS Provider Number 00123M
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