This is an internal function that computes Grubbs' method of moments estimators of precision for the nonconstant bias model using original data values.
A matrix or numeric data.frame consisting of an n (no. of items) by N (no. of methods) matrix of measuremnts. N must be >= 3 and n > N.
Either estimates of beta or hypothesized values (one for each method in an N vector).
See Jaech, p. 184.
Grubbs' method of moments estimates of the squared imprecision (variances).
Richard A. Bilonick
Jaech, J. L. (1985) Statistical Analysis of Measurement Errors. New York: Wiley.