**Simple Interactive Statistical Analysis**

The Negative Binomial vs 2 help page has moved to this location.

This negative binomial distribution is also known as the Pascal Distribution or the Polya Distribution. The negative binomial distribution does basically the same thing as the Binomial, except that now we are asking about the probability of a particular sample size, given that we have found 'x' results to be positive (or 'white', or 'car crashes'), whereas we had expected to find 'u' results to be positive.