JP-3718: Improve AMI observable averaging, error calculations #8846
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This PR addresses JP-3718, which changes how observables are averaged and their errors are calculated. Now calculating all "downstream" observables (i.e. calculated from fringe phases and amplitudes) from already-averaged fringe quantities, rather than calculating and then averaging. Now calculating covariances between related fringes and amplitudes (between baselines, triangles, and quads) and taking standard error of the mean (from covariance) as uncertainty.
Tasks
Build 11.3
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