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Wald's Sequential Probabilty
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Give two proportions
and the number of experiments.

Lower
proportion
Higher
proportion
Alpha
error
Power
Experiments



Sequential Probability Ratio Test (SPRT).
Cases are collected one at a time, and
after each case is collected a total
proportion is calculated and compared
with previously defined upper and
lower values of no differences. After
that a decision is made to accept or
to reject the null hypothesis of the
total proportion being inside the
predefined values or to continue
testing.