On Fri, 9 Apr 1999, Prof Brian D Ripley wrote:
ppois(q, lambda) where q is undefined! It should only be defined for integers. Similarly, x should only be integers.
Ummmm. I guess I see the argument for dpois, but I thought the distribution function was defined for all values. Wouldn't it be in order to apply the integer argument function to floor(q) perhaps? This seems to be what S does. > ppois(1.5, 2) [1] 0.4060058 > ppois(1.1, 2) [1] 0.4060058 Ross -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-devel mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-devel-request@stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._