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Appendix C Formula Functions Reference 481
Statistical Functions
Beta Binomial Probability
Returns the probability or cmf that a beta binomially distributed random variable is equal to x. When
the overdispersion parameter for the beta binomial is zero, the distribution reduces to a binomial(p, n).
Beta Binomial Quantile
Returns the quantile, which is the percentile of the probability of observing a beta binomial(p,n)
random variable of equal or smaller value. When the overdispersion parameter for the beta binomial is
zero, the distribution reduces to a binomial(p, n).
Hypergeometric Distribution
Computes the probability that a random variable from a hypergeometric distribution is less than or
equal to x. The hypergeometric distribution models the total number of successes in a fixed sample
drawn without replacement from a finite population. The hypergeometric functions accept as
arguments the size of the population N, the total number of items with the desired characteristic in the
population, K, the number of samples drawn n, and the number of successes in the sample x.
Hypergeometric Probability
Computes the probability that a random variable from a hypergeometric distribution is equal to x.
Poisson Distribution
Computes the probability that a random variable from a Poisson distribution with mean lambda is less
than or equal to the count of interest. In general, Poisson functions accept an argument that is the
count of interest, and lambda, the mean parameter.
Poisson Probability
Computes the probability that a random variable from a Poisson distribution with mean lambda is
equal to the count of interest.
Poisson Quantile
Returns the quantile, which is the percentile of the probability of observing a poisson(lambda) random
variable of equal or smaller value.
C Formula Functions Reference
Statistical Functions
See the JMP Scripting Guide for details about syntax.
Col Mean
Calculates the mean (or arithmetic average) of the numeric values identified by its argument. The
formula Col Mean(age) calculates the average of all nonmissing values in the age column.
Col Std Dev
Measures the spread around the mean of the distribution identified by its argument. In the normal
distribution, about 68% of the distribution is within one standard deviation of the mean, 95% of the
distribution is within two standard deviations of the mean, and 99% of the distribution is within three
standard deviations of the mean.