In article <[EMAIL PROTECTED]>,
Ting Ting <[EMAIL PROTECTED]> wrote:
>> A good example of a simple situation for which exact P values are
>> unavailable is the Behrens-Fisher problem (testing the equality of
>> normal means from normal populations with unequal variances). Some
>> might say we have approximate solutions that are good enough.
>would u pls give some more detail examples about this?
>thx
I can give you simple randomized procedures with easily
computable exact p-values, and which only lose in degrees
of freedom compared to known variances. Also, Linnik has
shown the existence of non-randomized procedures which can
do this.
--
This address is for information only. I do not claim that these views
are those of the Statistics Department or of Purdue University.
Herman Rubin, Dept. of Statistics, Purdue Univ., West Lafayette IN47907-1399
[EMAIL PROTECTED] Phone: (765)494-6054 FAX: (765)494-0558
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