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But for each value of i you have a different number of measurements

Posted By: rambiz
Date: Sunday, 24 July 2011, at 12:45 a.m.

In Response To: math/stat question (OT) (rambiz)

Chuck wrote: But for each value of i you have a different number of measurements.

If you are trying to find a probability, you are probably running a random experiment. Every time you do this experiment you have a random outcome xi. So all in all you have say N experiments, which outcomes has been x1-x2-...-xi-...-xn with the corresponding frequency of occurrence of n1-n2-...-ni-...-xn . So all in all you have repeated the experiment N times which is the same number of, in your words, "measurements" for all xi. I'm a bit confused! So my plan to find a variance for the sample probability p(xi)=ni/N won't work. BTW I meant it should be calculated as var=1/N-1*SUM(ni*{p(xi)-p(xi)_bar)^2} and not in the way I described earlier. I simply confused xi and p(xi). You lead me to the wrong PLANK. :) splash!

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