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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 gruffyddd[/i] [br]I have some data points on a scatter graph that I want do a line of best fit on. I'm doing Analysis->Fitting->Fit Linear and I get the required line solely within the range of my data points. However I need to extend this line in one direction - I think the proper term is extrapolate. This is very easy to do on Excel by just typing a number into the 'forecast' box. However I've spent quite a while trying to figure how to get Origin to do it, with no luck. Does anyone know how to do this? [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.