Is this the definition of BIG DATA? Thanks so much Lee, this is so interesting and accurate..
John > On Jul 2, 2018, at 2:52 PM, Lee Larson <[email protected]> wrote: > > On Jul 2, 2018, at 12:11 PM, Bill Rising <[email protected] > <mailto:[email protected]>> wrote: > >> Part of the difference could come from where she wears the fitbit. After >> some discussions in our family (back when there was a friendly competition >> about who could rack up the most steps), experimentation showed that many >> more steps got registered if the fitbit was on a sock/shoe than if it was >> near the waist, and near the waist registered more than near the neck. > > > I suspect this is right. I have a pretty good Omron pedometer, designed to be > worn at waist level. It is basically an accelerometer that counts steps by > measuring the acceleration and deceleration as I walk or run. The Apple Watch > is on my wrist and I’m much more likely to shake my wrist around, adding > phantom steps. > > I did an experiment this morning. The dog took me to Hays-Kennedy park and I > steadily walked on the track while counting my steps. I wore the following: > > • Omron pedometer near my right hip clipped to the waistband of my shorts. > • iPhone in my left pocket running the Pedometer++ app. > • Apple Watch on my left wrist. > • Garmin Vivofit on my right wrist. > > Here are the results: > > • 2578 = my count of the number of steps > • 2564 = Omron (0.5% low) > • 2607 = iPhone (1.1% high) > • 2702 = Apple Watch (6.6% high) > • 2637 = Garmin (4.1% high) > > It seems the ones near the hips are most accurate. > > L^2 > > PS/ Pedometer++ has the capability to average in the count from the Apple > Watch. I turned that off in its preferences. > > PPS/ The Apple Watch may have been skewed because I was holding a very active > leash in my left hand most of the time. > > --- > Lee Larson [email protected] <mailto:[email protected]> > > Alf Todd,’ said Ukridge, soaring to an impressive burst of imagery, ‘has > about as much chance as a one-armed blind man in a dark room trying to shove > a pound of melted butter into a wild-cat’s ear with a red-hot needle.’ — P. > G. Wodehouse > Ukridge, 1924 > > > > > > > > > _______________________________________________ > MacGroup mailing list > Posting address: [email protected] > Archive: > <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.mail-2Darchive.com_macgroup-40erdos.math.louisville.edu_&d=DwIFaQ&c=OAG1LQNACBDguGvBeNj18Swhr9TMTjS-x4O_KuapPgY&r=F2GFXrjLFqVo3VwvIlo_XYeEiRRjHv15rxcenz7A21woG2aFGcrzndoSsskxfmOs&m=MuF2qDSa8gL1aiWFRgaO8cKRsScXgx3pxrt38_dNCDA&s=b3SeYsdn4Hb8HyNDYzjlexg4mNyET8SV8A-hiwYqdAI&e=> > Answers to questions: <http://erdos.math.louisville.edu/macgroup/>
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