Re: st: R: question concerning clustering - second try

[Johannes Schoder <johannes.schoder@soi.uzh.ch>]

Thanks a lot for the reference and your feedback Carlo!
So I am not that wrong with clustering my s.e. for county.
Best,
Johannes

Carlo Lazzaro schrieb:
> Johannes wrote:
>
> < I assume that I have to cluster my standard errors since the
> observations within county i might be correlated within counties?>
>
> I don't think that Johannes'question is trivial.
> As far as I understand your research purpose, I would advise you to cluster
> standard errors for county, since individuals living in the same county are
> likely to share the same environment and healthy or unhealthy lifestyles,
> which may have some influence on mortality rates.
>
> For a more detailed discussion on this topic, I would refer you to:
> Kirkwood BR, Stern JAC. Essential medical statistics. Second edition.
> Malden, Mass: Blackwell Science, 2003: 355-370.
> Although focussed on clinical trials, the reported examples can be easily
> exported to other research fields and tweaked accordingly.
>
> Kind Regards,
> Carlo
> -----Messaggio originale-----
> Da: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] Per conto di Johannes Schoder
> Inviato: venerdì 18 settembre 2009 15.44
> A: statalist@hsphsun2.harvard.edu
> Oggetto: st: question concerning clustering - second try
>
> Dear Statalist Users:
>
> I haven't received any feedback so I hope my question is not too stupid:
> I am estimating the impact of the number of deaths per county and cause
> of death on the age at death per county and cause.
> I have information for each county: on the number, the mean age at
> death,  and the cause of death.
> The model looks like that:
>
> xi: reg  MeanAge_death log_n_death [aweight=n_death]
>
> where MeanAge_death is the average Age at death in county i due to cause c
> n_death: Number of death in county i due to cause c
>
> I assume that I have to cluster my standard errors since the
> observations within county i might be correlated within counties?
> Then my model would simply look like:
>
> xi: reg  age_death_i,c log_n_death [aweight=n_death],  robust
> cluster(county)
>
> But I am not sure if I also have to cluster according to different cause
> of death?
> Thanks a lot for any suggestion.
> Johannes
>
>
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