Functions and CALL Routines 
Returns the probability from a negative binomial distribution.

p

is a numeric probability of success parameter.
Range: 
0 p
1 

n

is an integer number of successes parameter.
Range: 
n 1 

m

is a positive integer random variable, the
number of failures.
Range: 
m 0 
The PROBNEGB function returns the probability
that an observation from a negative binomial distribution, with probability
of success p and number of successes n, is less
than or equal to m.
To compute the probability that an observation is equal
to a given value m, compute the difference of two probabilities
from the negative binomial distribution for m and m1.
SAS Statements 
Results 
x=probnegb(0.5,2,1);

0.5

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