1. Apparatus for analyzing multivariable data sets including a plurality of measured variables, said apparatus comprising: a neural network capable of receiving signals contained in said data sets and processing said signals according to an artificial intelligence program; and means for obtaining a matrix of weight parameters for said neural network and said data sets through a sequence of iterations, starting at random guess, and repeatedly averaging for many initial guesses until said matrix of weight parameters converge; and means of evaluation of the relationship between said variables from said weight parameters.