HP 39gII - Page 175

Using mathematical functions 165
fisher_icdf Inverse cumulative Fisher distribution function. Returns the
value x such that the Fisher lower-tail probability of x, with
numerator n and denominator d degrees of freedom, is p.
fisher_icdf(n, d, p)
Example:
fisher_icdf(5, 5, 0. .76748868087) returns 2.
poisson Poisson probability mass function. Computes the
probability of k occurrences of an event in a time interval,
given expected (or mean) occurrences of the event in
that interval. For this function, k is a non-negative integer
and is a real number.
poisson(, k)
Example:
poisson(4, 2) returns 0.14652511111.
poisson_cdf Cumulative poisson distribution function. Returns the
probability x or fewer occurrences of an event in a given
time interval, given expected occurrences.
poisson_cdf(, x)
Example:
poisson_cdf(4, 2) returns 0.238103305554.
poisson_icdf Inverse cumulative poisson distribution function. Returns
the value x such that the probability of x or fewer
occurrences of an event, with expected (or mean)
occurrences of the event in the interval, is p.
poisson_icdf(, p)
Example:
poisson_icdf(4, 0.238103305554) returns 2.
student Student's t probability density function. Computes the
probability density of the Student's-t distribution at x,
given n degrees of freedom.
student(n, x)
Example:
student(3, 5.2) returns 0.00366574413491.
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