Re: [R] R: stats

From: Duncan Murdoch <murdoch_at_stats.uwo.ca>
Date: Wed 20 Jul 2005 - 00:08:11 EST

On 7/19/2005 9:28 AM, Clark Allan wrote:
> for the stats gurus
>
> does anyone know if there exists a general formula relating the median
> of a continuous distribution to its moments. the distribution could be
> skewed or symmetric and is definitely not normal.

Not in general, and probably not any more practically useful than F^(-1)(0.5).

> the reason for asking is since the median of the particular distribution
> that i am interested in is difficult (probably impossible) to obtain.
> the median depends depends on an incomplete gamma distribution. the
> moments however can be obtained fairly easily.

R can calculate the incomplete gamma function (see ?pgamma), so that's not necessarily a stumbling block.

Duncan Murdoch



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