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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 Rollo78[/i] [br]Origin Ver. 8.5.0G SR0 Operating System: Windows 7 Hi there, i'am trying to do fits on beta spectra. (with the impuls analyzer) I want to use instrumental weighting and i have the square root of the events per channel in an extra column. When i do the fits with statistical weighting i get reasonable values for reduced chi-squared (1-1,6). When i switch to instrumental weighting with the same fit parameters (dataset for weighting is [Book1]Sheet1!C which is calculated by sqrt(Col(B))) i get numbers for reduced chi-squared in the range of thousand, exactly the same number which do i get when i switch to no weighting (again same fit parameters). Shouldn't the instrumental and statistical weighting give the same number for reduced chi-squared in my case? w_ij=sigma_ij^2=yij Is the instrumental weighting working if origin doesn't complain about the dataset? There is no hint in the results report that Origin actually have used instrumental weighting. What's wrong here? Any help is greatly appreciated! Best regards Marco [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.