PROCESSING OF PHYSICAL DATA - NOTES ON CO RRELATION

The interpretation of some latest very accurate physical data (like sp ectroscopical data) needs sophisticated models that often lead to corr elation problems. The aim of this paper is to show that, when necessar y, it is possible to work beyond correlation. The problems of numerica l correlation with linear or nonlinear model or the problem of exact c orrelation with nonlinear models can be solved (applications are made in the real case of the red system of NbN). This latter situation lead s to a new and interesting statistical point of view of the data treat ment; however, computations are generally far longer than in the usual situation of weak correlation. The proposed point of view is compared with other recent works about the problems encountered in data reduct ion.