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What is 3sigma ??
Posted:
Jun 19, 1996 12:38 AM


I have been developing an inertial sensor which senses rotation. One performance requirment is for bias stability of 0.03 deg/hr 3sigma. If the distribution of bias measurements were normal or gausian, then the formula would be simple.
3sigma = 3 * 1sigma = 3 * (variance) ^1/2
Unfortunately, the bias measurements look like a sin function with random noise. So, if the distribution is not normal, how do I calculate 3sigma???
Thanks for your help



