Nick,
[...]
> My Stata solution, however, was intended to be
> of more general interest, and not contingent on
> historical accidents, so I flagged the assumption
> of no ties as a warning for when it might bite.
Absolutely! Understood. Thanks once again for your very helpful solutions.
I'm spoilt for choice now! :-)
Yours,
CLIVE NICHOLAS,
Politics Building,
School of Geography, Politics and Sociology,
University of Newcastle-upon-Tyne,
Newcastle-upon-Tyne,
NE1 7RU,
United Kingdom.
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