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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 kulkarni[/i] [br]Origin Ver. and Service Release (Select Help-->About Origin): Operating System: I am a new user of Origin8. I would like to know that is it possible to do �gMultiple nonlinear regression analysis�h in this software? I found �gmultiple linear regression�h option in the Analysis tree. I got analytical data as follows, X1= independent variable X2= independent variable X3= independent variable Y= dependent variable For constant eg. X3=0.05 I have one table of X1, X2, Y as bellow, X1 |X2 |Y 0.05 |0.2 |17.77 0.05 |0.2 |15.33 0.05 |0.2 |19.45 �c |�c |�c �c |�c |�c 0.06 |0.4 |15.3 0.06 |0.4 |14.78 0.06 |0.4 |16.61 �c |�c |�c And for each X3=0.05,0.1,0.15,0.2 I have table of X1, X2, Y like above.. Hence my question is how to make final table format which will be necessary for multiple nonlinear regression analysis. I also want to develop an equation for example like: Y=a/((X1*X2^b-c)^d*(1+X3)^e)+f/(1+X3) I wish to have my final equation will not exactly like above one but closer to that. If anybody tackled this type of problem before then please help me. Waiting for the reply. Yours Sincerely, Kulkarni [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.