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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 Flonares[/i] [br]Hello, I am using OriginPro 2023 (64-bit) 10.0.0.154 (Academic). I have a set of data composed of eight spectra (Frequency (X) vs Intensity(Y)). They were all taken under the same conditions. What I wish to do is to check which ones I should discard - if any - due to bad data. I have read about similarity index evaluation (apparently, you pick a spectrum, calculate an average of all spectra excluding the one you wish to evaluate and then see how much it deviates, and you repeat it for all spectra in your data set) but I have no idea on how to implement it on Origin or if there is any tool already implement in Origin that would allow me to do it. Any help would be greatly appreciated! Kind regards, Fl0 [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.