negativeBinomial
Probability mass function 

Distribution 

Mean 

Variance 

The Negative Binomial distribution is a discrete distribution
bounded
on the low side at 0 and unbounded on the high side. The Negative
Binomial distribution gives the number of failures before the nth success in a sequence of independent Bernoulli trials with probability p of success on each trial.
The Negative Binomial distribution has many uses; some occur because it
provides a good approximation for the sum or mixing of other discrete
distributions. By itself, it is used to model accident statistics,
birthanddeath processes, market research and consumer expenditure,
lending library data, biometrical data, and many others.
Samples

negativeBinomial(double
p, double n)

Description
Generates a sample of the Negative Binomial distribution.
Parameters
Name 
Type 
Description 
p 
double 
probability of success on each trial 
n 
double 
number of desired successes 
Result
Type 
Description 
double 
the
generated sample 

negativeBinomial(double
p,
double n, java.util.Random r)

Description
Generates a sample of the Negative Binomial
distribution using the
specified random number generator.
Parameters
Name 
Type 
Description 
p 
double 
probability of success on each trial 
n 
double 
number of desired successes 
r 
java.util.Random 
the random
number generator 
Result
Type 
Description 
double 
the
generated sample 