Gregory Stark <[EMAIL PROTECTED]> writes:
> It's possible there's some sort of "block-wise correlated" measure
> which would be even better for our needs.

Actually, it seems obvious to me that the correlation measure ought to
ignore within-block ordering, but right now it does not.  OTOH it's not
clear how important that is, as on a decent-size table you'll probably
not have more than one sample row in a block anyway.

                        regards, tom lane

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