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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 hauli[/i] [br]Origin Version (Select Help-->About Origin): 7.5 Operating System: Windows XP Dear All, My question is rather theoretical and concerns the NLSF option VAR-COV Matrix. How are the single values calculated, what are the formulae behind them. The HESSE Matrix H is the Matrix of the second partial derivations. Taking the negative inverse of the HESSE Matrix (-1 * H^-1) leads to the Covariance Matrix. But when I calculate it by Hand, I get other values then displayed in ORIGINs VAR-COV Matrix. I am quite sure that my calculations are right, so what is the meaning of ORIGINs VAR-COV Matrix. I hope this is not too much math before the weekend. [:)] Thanks Hauli [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.