Jerry Dallal <[EMAIL PROTECTED]> wrote in sci.stat.edu:
>VOLTOLINI wrote:
>>
>> What is a P value? Does anyone can give a simple explanation? I am not
>
>A P value is the smallest fixed level for which the test statistic
>would lead to rejection of the null hypothesis. For example, if P =
>0.023, then anyone who tested the corresponding null hypothesis at a
>fixed level greater than 0.023 (e.g., 0.05) would reject, while
>anyone working at a fixed level less than or equal to 0.023 (e.g.
>0.01) would fail to reject.
Maybe I'm not understanding you, but that sounds like a tautology
and not a definition. We preselect an alpha, and then we reject the
null hypothesis if p < alpha. To say that p is the smallest level
for which you would reject is just to say that you reject if p <
alpha.
Am I missing something in your explanation?
--
Stan Brown, Oak Road Systems, Cortland County, New York, USA
http://OakRoadSystems.com/
"Walrus meat as a diet is less repulsive than seal."
-- Harry de Windt, /From Paris to New York by Land/ (1904)
.
.
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