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Febble Donating Member (1000+ posts) Send PM | Profile | Ignore Sat Jun-16-07 06:22 PM
Response to Reply #73
76. Well,
you'd have to do a log transform first (log of 1.66 and log of 1.16) and compute the difference. Then you could work out the necessary variability from there, given an N of between 20 and 30.

And don't ignore the effect of boundary changes.

If there's one point I'd like to reiterate, it's that at precinct level there is far greater variability than most people credit. And once the cell sizes get small in the cross tabulations, that variability can wreak havoc with your conclusions.
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