Re: Finding Regression Coefficient

*To*: mathgroup at christensen.cybernetics.net*Subject*: [mg1200] Re: Finding Regression Coefficient*From*: Andreas Fischer <w81b8512 at infosrv.RZ.UniBw-Muenchen.de>*Date*: Tue, 23 May 1995 02:17:33 -0400*Organization*: University of the Federal Armed Forces Munich

tesch at titan.oit.umass.edu (Ralf Tesch) wrote: >Hi there, > >being one of the many people having questions about NonlinearFit[], mine >is about finding the regression coefficient r^2 of the solution given by >Mma. >There is no hint in the Standard Packages Manual (at least I didn't find >any...) >Is there a way implemented in Mma or is that coefficient to be calculated >seperately - how??? >Thanks for help > >Ralf > >____________________________________________ >Ralf Tesch >Department of Food Science >Univ. of Mass., Amherst >tesch at ipo.umass.edu > I think it is not allowed to compute r^2, because this coefficient (BRAVAIS-PEARSON correlation coefficient) is only appropriate for linear regressions. A high r or r^2 doesn't tell anything about the correlation between x and y if you assume a nonlinear function between them. If I am wrong with this or if someone knows a nonlinear regression coefficient, please let me know. Andreas Fischer University of Armed Forces Munich, Germany andreas.fischer at rz.unibw-muenchen.de