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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 ria7777[/i] [br]dear origin team! I would like to fit several data points with error and direct weighting. However, I get different results than a friend of mine using the same data set a.nd fitting parameters. Even if I fit the data in her graph, I get the same values for intercept and slope, but significantly different values for standard errors. My friend uses origin 8. (both graphs are attached) How could this be? Which values are "true"? Thanks in advance!! Origin Ver. and Service Release (Select Help-->About Origin): OriginPro 9.0.0 Operating System: Windows 7 [url]http://www.originlab.com/ftp/forum_and_kbase/Images/graphs incl fitting.xlsx[/url] [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.