henry copeland: Margin of error on common activity (mis)counters: pllqt.it/AF8Osv
BodyMedia FIT: 9.3 percent Fitbit Zip: 10.1 percent Fitbit One: 10.4 percent Jawbone Up: 12.2 percent ActiGraph: 12.6 percent Directlife: 12.8 percent Nike FuelBand: 13 percent Basis Band: 23.5 percent
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