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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 fabif[/i] [br]Origin Ver. and Service Release (Select Help-->About Origin): 8G SR6 Operating System: Windows 7 I fitted measurement values with a non linear function using 4 free parameters with the NLFIT Method. Can anyone tell me the calculation procedure of the correlation matrix within the NLFIT analysis? Which correlation method is normally used (Pearson, Kendall, Spearman)? To my knowledge the Pearson Method is only valid for linear function. Does a possibility exist to change the automatic calculation procedure of the correlation matrix? Thank you! Fabian Fischer [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.