Re: st: thanks / a new question - heterogeneity test

[Nicola Orsini <nicola.orsini@ki.se>]

Hi Andrei,

you can get the Q statistic, its p-value and the I2 statistic in 
different ways:

1) Use -metan- instead of -meta- command

The Q-test  is stored in   r(het)
The p-value is stored in   r(p_het)

2) Use -metareg- instead of -meta- command

The Q-test  is stored in  e(Q)
The degrees of freedom of Q is stored in  e(df_Q)

Then, you can easily calculate the p-value by yourself
scalar p_het = chiprob(e(df_Q), e(Q))

Nicola


Andrei Malinovschi wrote:

> Dear statalisters,
>
> I would like to start by thanking you for the quick
> answer - special thanks to Maarten Buis, Neil
> Shephard, Roger Newson and Herv� Stolowy. I got both
> the answer + further ideas how to improve the process
> / my analysis.
>
> I have now another problem when doing a metaanalysis
> and running the meta command. I am interested in the
> random pooled estimate (95% CI) and heterogeneity test
> (Q and p-value). I have found that the random effect
> (95%CI) is stored in the global macros S_1, S_3, S_4,
> but I cannot find where Q and the p-value for
> heterogeneity test are stored. Any suggestions or
> another way to retrieve them?
>
> A possible solution that I was thinking about and it
> is probably too complicated would be to calculate Q
> (from the mathematical formula) and then use heterogi
> to get both the p-value for heterogeneity test and
> even I^2 that is not given by meta command.
>
> Thanks in advance!
>
> Best regards,
> Andrei
>
>
> 	
> 		
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