st: correlation with panel data

[ricardo f <ricardo.stata@googlemail.com>]

Dear Statalist,

I have a small panel of price data in ten cities over 24 months, i.e.
the panel is set up as :

xtset city_ID t

I would like to calculate the price correlation for each pair of city
over the two years – how can I do this in stata?

Thanks for your help

ricardo

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