<<Unlikely to be the other factors that were considered, of course. The
problem with research like this is that you can never prove that you
allowed for ALL possible factors. This is why scientists prefer
labratories to the "real world.">>>

Incorrect.
And with all due respect, one can, to a large extent, eradicate, or 
reduce to insignificant, the possibility that an effect/result is due 
to other possible factors within a statistical analytical study.

For example: Quote: 
"Hagelin's study used time series analysis to rule out a long list of 
alternative explanations, including weather variables, seasonal 
effects, changes in police surveillance, and trends and cyclical 
patterns inherent in the crime data."
http://istpp.org/crime_prevention/voodoo_rebuttal.html

OffWorld.





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