[Date Prev] | [Thread Prev] | [Thread Next] | [Date Next] -- [Date Index] | [Thread Index] | [List Home]

*Subject*: **Re: [office-formula] BETADIST parameter Cumulative**

*From*:**"Andreas J. Guelzow" <aguelzow@math.concordia.ab.ca>***To*: Eike Rathke <erack@sun.com>, OASIS ODFF SC <office-formula@lists.oasis-open.org>*Date*: Fri, 16 Mar 2007 14:30:51 -0600

On Fri, 2007-16-03 at 19:33 +0100, Eike Rathke wrote: > Hi, > > Our definition of BETADIST currently has a 6th optional parameter > Logical Cumulative = TRUE() that is not supported by any of the "usual" > applications. If FALSE(), BETADIST is supposed to return the value of > the probability density function. If TRUE(), the value of the cumulative > distribution function, which is what applications do. Additionally it > doesn't have the constraint a <= x <= b that applications have, and > explicitly says so. > > Where did that originate from? > > I propose to remove that parameter and to add the constraint, otherwise > the function would be incompatible with all applications, it seems. BINOMDIST, EXPONDIST, GAMMADIST, HYPGEOMDIST, NORMDIST have an optional argument (in XL, gnumeric,...) to switch between cumulative and non-cumulative answers. Is there any reasonable justification why other ...DIST functions do not have the same switch (other than well XL picked that at random). It would be easy to add this optional parameter to the programs. Mathematically, the cumulative distribution and the density are defined for all values of x, so there is no justification to have an constraint such as a <= x <= b. The answer outside that range should just be 0 (or 1 in the case of cumulative if b < x). The question is now mathematically correct the function definitions should be. Andreas -- Andreas J. Guelzow, Professor Dept. of Mathematical & Computing Sciences Concordia University College of Alberta

**Follow-Ups**:**Re: [office-formula] BETADIST parameter Cumulative***From:*Eike Rathke <erack@sun.com>

**References**:**BETADIST parameter Cumulative***From:*Eike Rathke <erack@sun.com>

[Date Prev] | [Thread Prev] | [Thread Next] | [Date Next] -- [Date Index] | [Thread Index] | [List Home]