Theleast squares criterion is one of the foundations of estimation theory. This is the theory
that concerns extracting the true value of signals from noisy measurements. Estimation
theory techniques have been used to guide Exocet missiles and astronauts on moon missions
(where navigation data was derived using sextants!), all based on techniques which employ
the least squares criterion. The least squares criterion was originally developed by Gauss
when he was confronted by the problem of measuring the six parameters of the orbits of ...
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