Error message

Deprecated function: The each() function is deprecated. This message will be suppressed on further calls in book_prev() (line 775 of /home3/gardeoi3/public_html/iamrandom/modules/book/book.module).
Deprecated function: implode(): Passing glue string after array is deprecated. Swap the parameters in drupal_get_feeds() (line 394 of /home3/gardeoi3/public_html/iamrandom/includes/common.inc).

Gamma distribution properties

By tholscla on Fri, 01/10/2014 - 15:36

R defines the Gamma(a,b) with b as a rate (the R helpfile gives the scale version of the Gamma distribution in an equation). f(x)= b^a/( Gamma(a)) x^(a-1) e^-(bx). The mean is a/b and the variance a/b^2.

Or Gamma(a, b) parameterized by a mean and variance, where u=a/b and s^2=a/b^2. Then a=u^2/s^2 and b=u/s^2.