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    How to evaluate effectivness of recommendations to clients

    Hello everyone. Generally speaking, we have this business where clients can purchase goods online if they are registered. We want to provide each of our customers with some custom recommendations and we need to find out if our advertisement system is working properly. Background: I am not a...
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    Standard Error associated to a variable percentage

    Context: I am a programmer, not a statistician, and I have only some vague ideas of statistical concepts. Also, my english is far from perfect, be patient please. My client needs an estimate of the percentage of taxes he is going to pay, based on what happened in the recent past. He needs...