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I quote from the summary atClassifying a weekly political poll as an embodiment of scientific fraud
http://www.dailykos.com/storyonly/2010/6/29/15117/8738
I have just published a report by three statistics wizards showing,
quite convincingly, that the weekly Research 2000 State of the Nation
poll we ran the past year and a half was likely bunk.
... [a couple of pages] ...
The longer report is at
http://www.dailykos.com/story/2010/6/29/880179/-Research-2000:-Problems-in-plain-sight
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I mention it in this forum because we all deal with data for
a living.
Scientific fraud is very rare, but it is also hard to catch.
It is instructive to see what spurious data looks like, and
to see the techniques used to detect it.