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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Anti-Spam Code: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by UKrieger[/i] [br]Origin Ver. and Service Release (Select Help-->About Origin): 7.5SR7 Operating System: XP Hi all, I do have a problem doing a global fit to two datasets (of different length) with 2 different functions but shared parameters. Parameter Names: A,B,C Independent Var.: xs1, xs2 Dependent Var.: out1, out2 out1=xs1*xs1*(A+3*B+5*C-(4*B+16*C)*xs1+12*xs1*xs1); out2=(1-xs2)*(1-xs2)*(A+B+C-(4*B+8*C)*xs2+12*xs2*xs2); xs1 and xs2 span the range from 0 to 0.5. But Dataset 1 [out1(xs1)] has 114 data points while Dataset 2 [ou2(xs2) has only 15 data points. Now the non linear curve fitting fits Dataset 1 only in the range of the data of the first 15 data points. Any suggestion what to do? Thank you, Uli [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.