At 12:39 PM 8/16/01 +0100, Thom Baguley wrote:
> For example, if a new drug is administered to a
>treatment group made up of serious cases and compared to a control
>group of mild cases obtaining more "cures" for the treatment group
>might be considered better evidence than a random sample.
>
>Thom
sorry ... i can't agree with this ...
it could be that in the "serious" cases ... there is a unidentifiable gene
factor that INTERACTS with the treatment ... that is not available in the
"mild" cases group (that's why you have serious and mild cases) ... so, it
is not the treatment that is doing this ... it is the presence or lack of
presence of the gene factor
in the above ... you are trying to identify ... IF there is an effect, WHAT
it is due to and, the design tendered above will not do that
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_________________________________________________________
dennis roberts, educational psychology, penn state university
208 cedar, AC 8148632401, mailto:[EMAIL PROTECTED]
http://roberts.ed.psu.edu/users/droberts/drober~1.htm
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