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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 privat_pansell[/i] [br]I'm trying to fit an Exp Decay 1 function to an eye movement response. The peak value is approx 5 degrees and then decays towards 0. I have used the data selector to choose an appropriate range (from the top of the response and some secs after the recording flattens out. My A1 value gets extremely high (millions), I have tried to fix (lock) the A1 to 5-10 but this gives an incorrect fitting of the curve. Does anyone know what I'm doing wrong? //Tony Origin Ver. Origin Pro 2017 and Service Release: SR2 Operating System: PC, Windows 10 Pro [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.