well, i don't have the answer but, a quick simulation (when the ratio of
variances is about 2) is as follows
maybe this helps in some strange way
===
MTB > rand 1 c1-c25;
SUBC> norm 100 5.
MTB > rand 1 c26-c50;
SUBC> norm 100 7.07.
MTB > rstdev c1-c25, c51
MTB > rstdev c26-c50, c
Alan McLean wrote:
>
> Hi to all.
>
> Can anyone tell me what is the distribution of the ratio of sample
> variances when the ratio of population vriances is not 1, but some
> specified other number?
*If* the population distributions are normal (and this is not a
robust assumption -
On Fri, 4 May 2001, Alan McLean wrote:
> Can anyone tell me what is the distribution of the ratio of sample
> variances when the ratio of population variances is not 1, but some
> specified other number?
Depends. If the two samples on which the variances are based are
_independent_, s^2(1)/s^2
