The aim of this article is to discuss the distribution function of the number of subsequent users of a new treatment. A Bayesian approach is applied. Using the fact that the number of subsequent users of the new treatment will not be high, unless it is, in the statistical and also in the clinical sense, significantly better than the existing one, we obtain the distribution function of the number of subsequent users of a new treatment for which we assume the data have come from a normal distribution.
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