This is a fast implementation of the pivotal method.
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An array of length N such that the sum of prob is equal to the sample size.
A small real value that is used for tolerance in determining if the value is included or excluded from the sample.
An array of indexes from prob. Indexes with this list are sampled.
Deville, J.-C. and Tillé, Y. (1998). Unequal probability sampling without replacement through a splitting method. Biometrika 85, 89-101.
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