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From |
Bryan Griffin <bwgriffin@georgiasouthern.edu> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
st: Fuction Fden Help |

Date |
Mon, 5 Mar 2012 13:05:12 -0500 |

Hi -- I would like to create a plot showing density of F distribution for various degrees of freedom, but I'm having difficulty getting this to work. I was not able to find an example for the F distribution in the archives or on the net, but I found this example which works well for the normal distribution: graph twoway function normden(x, 0, 1) , range(-5 5) So using that as an example, I tried a number of variations of this twoway function Fden(3,20,1) No matter what numbers I place within the Fden() function the returned graph is a flat line. I also tried specifying a range, like this twoway function Fden(3,20,1), range(.1 100) but, again, no matter which numbers I try the graph returns a flat line. Any suggestions? Thanks, Bryan P.S. Here's the Function help information: Title [D] functions -- Functions Probability density function Fden(n1,n2,f) Domain n1: 1e-323 to 8e+307 (may be nonintegral) Domain n2: 1e-323 to 8e+307 (may be nonintegral) Domain f: -8e+307 to 8e+307 Interesting domain is f > 0 Range: 0 to 8e+307 Description: returns the probability density function for the F distribution with n1 numerator and n2 denominator degrees of freedom. returns 0 if f < 0. * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: Fuction Fden Help***From:*Alan Neustadtl <alan.neustadtl@gmail.com>

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