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Re: wrong question...

Estes,

If you can't tell one from another, how are you supposed to tell which you like better? It is circular.

A double blind trial that asks a patient if he feels better can be a valid forced choice procedure. If patients are just as likely to say they feel better after receiving a placebo, you can conclude the treatment is not efficacious; OTOH, if patients reliably feel better after taking the treatment, you can conclude it is efficacious. Of course, in a double blind test neither the giver nor receiver know in advance whether the treatment or placebo was given.

Regrading an earlier poster who posits fatigue as a dependant variable, that is a complex, ill defined variable too subject to confounding to be reliable.

db

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