Calculate the bias of a measurement against a gold standard. Two gold standards are used in this function: 1) measurements made by a supervisor or a known expert; and, 2) median of all measurements made by the observers.
estimate_bias(msur, msup, mall)
A numeric value or vector of mean measurements from observers
A numeric value or vector of mean measurements from supervisor
A numeric value or vector of the median of measurements from observers
A numeric value or vector signifying bias