Statistics Dictionary

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Negative Binomial Random Variable

A negative binomial random variable is the number X of repeated trials to produce r successes in a negative binomial experiment .

Suppose we flip a coin repeatedly and count the number of heads (successes). If we continue flipping the coin until it has landed 2 times on heads, we are conducting a negative binomial experiment. The negative binomial random variable is the number of coin flips required to achieve 2 heads. In this example, the random variable can take on any integer value between 2 and plus infinity.

See also:   Tutorial: Negative Binomial Probability Distribution | Negative Binomial Calculator