In this September 2011 talk, Ben Goldacre describes how companies withhold data from trials to manipulate the results from the remaining data. He describes it as taking away half the results from a coin tossing trial and convincing people that you have a two headed coin. He also describes trials that eliminate controls for the placebo effect. The placebo effect is stronger for two sugar pills than one. The placebo effect is even stronger when you inject salt water than when you give sugar pills. You can view his talk on Battling bad science by clicking the hyper link.
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