There are many answers to this, but dinner
supervenes.
If you push hard enough, and show why it is
needed, either StataCorp or a user
will write a program for this.
The evidence since 1999 has been that such
a program is not needed.
Nick
[email protected]
Marcello Pagano
> Why buy Stata if you are expected to do all this for yourself?
> Nick Cox wrote:
> > Apply -ln()-, -exp()- and -cond()- as needed.
> >
> > Nick
> > [email protected]
> >
> > Marcello Pagano
> >
> >
> >> Just concerned with the accuracy.
> >>
> >
> >
> >> Nick Cox wrote:
> >>
> >
> >
> >>> Roger's posting includes what I presume is an allusion to
> >>> an -egen- function _ghyper.ado that I wrote in 1999.
> >>>
> >>> I withdrew this program as redundant some years ago,
> >>> given that you can use something like
> >>>
> >>> comb(K, k) * comb(N - K, n - k) / comb(N, n)
> >>>
> >>> wherever you want. In context N, K, n, k may be
> >>> variables, scalars or placeholders for numeric
> >>> constants, or any mixture thereof.
> >>>
> >>> This might need a wrapper to yield zeros where
> >>> appropriate, or it might need care whenever
> >>> individual terms get very large, but otherwise
> >>> does it raise any problems?
> >>>
> >>> Nick
> >>> [email protected]
> >>>
> >>> Marcello Pagano
> >>>
> >>>
> >>>
> >>>> I looked at --ssizebi-- but it seems to be focused on power
> >>>> and sample
> >>>> sizes.
> >>>>
> >>>>
> >>>
> >>> Newson, Roger B wrote:
> >>>
> >>>
> >>>
> >>>>> Thanks to Marcello for telling us all about this
> >>>>>
> >> recently-published
> >>
> >>>>> algorithm, which looks very useful. A search on
> >>>>>
> >>>>> findit hypergeometric
> >>>>>
> >>>>> in Stata finds a single reference (to a SSC package), which was
> >>>>> distributed as long ago as 1999. This suggests that the new
> >>>>>
> >>>>>
> >>>> algorithm
> >>>>
> >>>>
> >>>>> might be a good candidate for implementation in Mata by
> >>>>>
> >>>>>
> >>>> Marcello, or by
> >>>>
> >>>>
> >>>>> anybody else with the time and inclination to do so.
> >>>>>
> >>>>>
> >>> Marcello Pagano
> >>>
> >>>
> >>>
> >>>> Does anyone have or know of Stata code to calculate the
> >>>>
> >> Hypergeometric
> >>
> >>>> Distribution accurately?
> >>>>
> >>>> See Journal of Discrete Algorithms , Volume 5 , Issue 2
> >>>>
> >> (June 2007)
> >>
> >>>> Pages: 341-347 for an article by Berkopec, HyperQuick
> >>>>
> >> algorithm for
> >>
> >>>> discrete hypergeometric distribution
> >>>>
> >>>>
> >
<http://portal.acm.org/citation.cfm?id=1240586&coll=GUIDE&dl=GUIDE&CFID=
>
>>> 27443384&CFTOKEN=80678482>.
>>>
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