Displaying 3 results from an estimated 3 matches for "pbetai".
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pbeta
2020 Mar 26
4
unstable corner of parameter space for qbeta?
I've discovered an infelicity (I guess) in qbeta(): it's not a bug,
since there's a clear warning about lack of convergence of the numerical
algorithm ("full precision may not have been achieved"). I can work
around this, but I'm curious why it happens and whether there's a better
workaround -- it doesn't seem to be in a particularly extreme corner of
parameter
2020 Mar 26
0
unstable corner of parameter space for qbeta?
...imations is not
going to help sufficiently).
Also not (in the R sources) tests/p-qbeta-strict-tst.R
a whole file of "regression tests" about pbeta() and qbeta()
{where part of the true values have been computed with my CRAN
package Rmpfr (for high precision computation) with the
Rmpfr::pbetaI() function which gives arbitrarily precise pbeta()
values but only when (a,b) are integers -- that's the "I" in pbetaI().
Yes, it's intriguing ... and I'll look into your special
findings a bit later today.
> Should I report this on the bug list?
Yes, please. Not al...
2020 Mar 26
2
unstable corner of parameter space for qbeta?
...sufficiently).
>
> Also not (in the R sources) tests/p-qbeta-strict-tst.R
> a whole file of "regression tests" about pbeta() and qbeta()
> {where part of the true values have been computed with my CRAN
> package Rmpfr (for high precision computation) with the
> Rmpfr::pbetaI() function which gives arbitrarily precise pbeta()
> values but only when (a,b) are integers -- that's the "I" in pbetaI().
>
> Yes, it's intriguing ... and I'll look into your special
> findings a bit later today.
>
>
> > Should I report this on...