Re: [R] qcc.overdispersion-test

From: Lao Meng <laomeng.3_at_gmail.com>
Date: Wed, 06 Apr 2011 15:16:21 +0800

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_at_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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>

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