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RE: st: RE: Randomization with ralloc


From   "Trelle Sven" <strelle@ctu.unibe.ch>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: RE: Randomization with ralloc
Date   Tue, 3 Apr 2012 20:53:42 +0200

Dear Alp,
I do not know what kind of study/trial you plan but here is just a cautionary note on using only blocks of 2: 

If it is a randomized-controlled trial where participants are recruited sequentially it will be very difficult if not impossible to conceal the allocation: investigators will be able to know the next allocation in every other patients even before actually randomizing the participants.

But as said, I do not know the exact study design so it might be appropriate anyway.

Sven



-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of T. Alp Ozkan
Sent: Dienstag, 3. April 2012 18:47
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: RE: Randomization with ralloc

Dear Sven,

With option osize(1) I've got what I need. When considered to 1040 patients it's easier to finish a study with 960 patients.  With your help it's possible now.

Thank you for your help.
alp

On Tue, Apr 3, 2012 at 3:54 PM, Trelle Sven <strelle@ctu.unibe.ch> wrote:
> block
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