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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 UKrieger[/i] [br]Origin Ver. 2017G b9.4.0.220 Operating System: Win 10 Dear colleagues, I have a question concerning the behavior of the confidence interval when fitting data with prescribed instrumental error. If I set the instrumental error to be 10% of the data values, the fitting routine gives me a 95% confidence interval. But if I change this instrumental error (either to 1% or to 80%) this does not effect the confidence interval at all. However, if I prescribe no error, I get a much smaller confidence interval. Do I make a mistake here? Best, Uli Krieger [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.