Greetings: In the documentation for dbinom: _______________________________________________________ References: Catherine Loader (2000). _Fast and Accurate Computation of Binomial Probabilities_; manuscript available from <URL: http://cm.bell-labs.com/cm/ms/departments/sia/catherine/dbinom> _______________________________________________________ the URL is dead. Here's one that works: _______________________________________________________ References: Catherine Loader(2000). _Fast and Accurate Computation of Binomial Probabilities_; manuscript and C listing available from <URL: http://www.herine.net/stat/software/dbinom.html> _______________________________________________________ Her web site is <URL: http://stat.cwru.edu/~catherine/ >; email address: <catherine at case.edu>. --Ivan Frohne