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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 OriginForaging[/i] [br]Origin Ver. and Service Release (Select Help-->About Origin): Operating System: Hey, Using origin 2020. I will be very grateful if anyone could help me, please! So ALL of my experiments basically rely on me comparing exponential curves for different experiments (concentration vs time). Anyway, I've never had a problem using the exponential functions before but I'm getting some really not-okay graphs. I have tried playing around with -type of exp. curve I am fitting, the number of iterations I allow Origin to run through (less seems to make it better, but it's still a poor fit. The crucial element is that I get an equation in the form y = y0 + A*exp(R0*x) for my line.[B)] It's not like my data is ridiculous, I can draw a clear hand curve through it so I don't think the data is the issue. One example is attached. I would gratefully appreciate any tips, I'd consider it an early (and the BEST) Christmas present![:o)] Thank you[:)][img]https://my.originlab.com/ftp/forum_and_kbase/Images/Screenshot%202021-12-17%20204414.jpg[/img] [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.