I have just found that OpenOffice.org-Calc uses the following functions:
"GAMMADIST(number, alpha, beta, C) Returns the values of a Gamma cumulative
distribution. Number is the value for which the Gamma distribution is to be
calculated. Alpha is the parameter Alpha of the Gamma distribution. Beta is
the parameter Beta of the Gamma distribution. C = 0 calculates the density
function, and C = 1 calculates the distribution.
GAMMAINV(number, alpha, beta) Returns the inverse of the Gamma cumulative
distribution. This function allows you to search for variables with different
distribution. Number is the probability value for which the inverse Gamma
distribution is to be calculated. Alpha is the parameter Alpha of the Gamma
distribution. Beta is the parameter Beta of the Gamma distribution.
GAMMALN(number) Returns the natural logarithm of the Gamma function, G(x),
for the given number."
--
Ignacio Diaz-Emparanza
DEPARTAMENTO DE ECONOMÍA APLICADA III (ECONOMETRÍA Y ESTADÍSTICA)
UPV/EHU
Avda. Lehendakari Aguirre, 83 | 48015 BILBAO
T.: +34 946013732 | F.: +34 946013754
www.et.bs.ehu.es