On Tue, 14 Nov 2017, Jules Davy wrote: > I'm using gretl 2017c and tried to use the pdf function with a > binomial distribution. According to the command reference, which says > refer to the cdf function for the required scalar arguments, there are > only 2 (apart from the string which identifies the distribution -- in > this base "B"). But shouldn't there be 3 arguments? Yes, three arguments are needed. Maybe the doc isn't clear enough, but for all the cdf and pdf cases we're dividing the arguments into two categories: first the required parameters, then the "x" value or point at which the function should be evaluated. In the case of the binomial we need two parameters, probability and number of trials, followed by "x" = number of successes. Similarly, we say that the Student t case needs just one parameter (df), again followed by an "x" value. > For example to find the probability of 3 successes in 5 flips of a > coin we need 0.5, 3, and 5. I got this command to work after messing > around for a while and first getting some errors: > > x = pdf(B, 0.5, 5, 3) > Replaced scalar x = 0.3125 > > On page 114 of the command reference only the probability and the > number of trials are given as required arguments, not the number of > successes. We say, "Between the arguments d and x, zero or more additional scalar arguments are required to specify the parameters of the distribution." The idea is that "x" is always required as the final argument. Allin Cottrell _______________________________________________ Gretl-users mailing list Gretl-users(a)lists.wfu.edu http://lists.wfu.edu/mailman/listinfo/gretl-users