| -----Original Message----- | From: boost-bounces@lists.boost.org | [mailto:boost-bounces@lists.boost.org] On Behalf Of Deane Yang | Sent: 11 July 2006 17:15 | To: boost@lists.boost.org | Subject: Re: [boost] [math/staticstics/design] How best | tonamestatisticalfunctions? | | > What about the Qs? (complements) | | In other words, 1 - P. Right? One response is why do you | need to define | it, given how easy it is to get from the cumulative density function? | | If not, use a common name for it. Unfortunately, I don't have a good | suggestion. Perhaps not really needed? Is there an accuracy reason for both? | I've always seen it referred to as the cumulative density function (CDF for short). Agree common - but not all. | > But excessively long :-( | Compared to what? I personally am very grateful that I no longer see | short, cryptic function and variable names in code. OK, I'm persuaded, but what to others think? | Here's a first stab (I'm sure it can be improved): | | class StudentsT | { | public: | explicit StudentsT(double degrees_of_freedom); | | double density(double x) const; | double cumulative_probability(double x) const; | double quantile(double probability) const; | // Also known as inverse cumulative. | | double degrees_of_freedom(double quantile, double probability) const; | | // Functions below may return NaN, if undefined. | double mean() const; | double variance() const; | double skewness() const; | double kurtosis() const; | }; Thanks - I think I like it. Others views? Paul PS Never written a line of C in my life ;-) --- Paul A Bristow Prizet Farmhouse, Kendal, Cumbria UK LA8 8AB +44 1539561830 & SMS, Mobile +44 7714 330204 & SMS pbristow@hetp.u-net.com