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Old 08-07-2010, 02:56 PM   #42 (permalink)
dcb
needs more cowbell
 
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assuming the magnets are easy to install, you can do ABA testing (see link) rather simply with the magnets off and on and off again (or vice versa). It isn't perfect, because the sample size is very low and it isn't a double blind test (the observer effects the result), but it is better than nothing.
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