R help - Apr 2011 - qcc.overdispersion-test

Hi all,

I have made an overdispersion test for a data set and get the following result

Overdispersion test Obs.Var/Theor.Var Statistic p-value
        poisson data          16.24267  47444.85       0


after deleting the outliers from the data set I get the following result


Overdispersion test Obs.Var/Theor.Var Statistic p-value
        poisson data          16.27106         0       1


The problem is that the overdispersion parameter does not really  
change, but how could the p-value and the statistic change so that the  
null hypothesis is accepted??

I would be very grateful if someone could help me?

hi:
Another question abour overdispersion test.

I wanna make sure that:
if p value<0.05,then the data is NOT overdispersion;
if p value>=0.05,then the data IS overdispersion.

I'm not sure whether it's true,just get the above conclusion from
simulated
data.

Thanks for your help.



2011/4/2 <sahin@hsu-hh.de>
> Hi all,
>
> I have made an overdispersion test for a data set and get the following
> result
>
> Overdispersion test Obs.Var/Theor.Var Statistic p-value
>       poisson data          16.24267  47444.85       0
>
>
> after deleting the outliers from the data set I get the following result
>
>
> Overdispersion test Obs.Var/Theor.Var Statistic p-value
>       poisson data          16.27106         0       1
>
>
> The problem is that the overdispersion parameter does not really change,
> but how could the p-value and the statistic change so that the null
> hypothesis is accepted??
>
> I would be very grateful if someone could help me?
>
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> PLEASE do read the posting guide
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http://www.R-project.org/posting-guide.html<http://www.r-project.org/posting-guide.html>
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>
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