I used an SAS platformm 9 years ago that used the Levenberg-Marquardt algorithm (SAS software (SAS 9.1.3 on a Service Pack 2 on a XP Pro Platform) that allowed to solve 12 simultanous equations for which there were more variables than equations. Is this platfrom still available? Examples: DVK = [Dk3 + b*(Dk5 + a)/(1 + b(1+a) = 1.5 DKac = [Dk5 + c + Keq3*b*c]/[1 + c + Keq3 + bc + Keq5(1+d)] = 1.4 Kac = k7Keq3Keq5/[1 + c + Keq3 + bc + Keq5(1+d)] = 400 etc Thanks
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