From: a_chilakapati@ccmail.pnl.gov ( Ashokkumar Chilakapati ) Newsgroups: sci.math.num-analysis Subject: Re: 4 parameter curve fitting Date: 21 Apr 1995 20:36:20 GMT NETLIB has several codes for nonlinear regression. They are quite good. The ones I use frequently are DQED (by Richard Hanson) and a version of NL2SOL (Dennis , Schnobel & Gay). Good Luck. - ashok --- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Ashokkumar Chilakapati %% BATTELLE, Pacific Northwest Laboratories %% a_chilakapati@ccmail.pnl.gov P.O. Box 999 %% Phone : (509) 372 - 6077 Mail Stop K9-36 %% Fax : (509) 372 - 6089 Richland, WA 99352 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%