Quote:
Originally Posted by David Bailey  I have a suspicion that this may be the heart of the problem. Splitting people into two groups and just telling one lot to go home (and not seek out any other treatment!) may be very hard. Probably if you want to test the power of the placebo effect, you really do need to compare it against clinical expectations. |
I don't understand. How are you going to tell if the placebo does something if you don't compare it to a matched group not taking a placebo?