Published the aforementioned post, which illustrates exactly how biased measurements are just a stats problem: <a href="https:&#x2F;&#x2F;www.chrisstucchio.com&#x2F;blog&#x2F;2016&#x2F;bayesian_calibration_of_mobile_phone_compass.html" rel="nofollow">https:&#x2F;&#x2F;www.chrisstucchio.com&#x2F;blog&#x2F;2016&#x2F;bayesian_calibration...</a>