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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 Forum: Origin Forum Subject: Message: * HTML is OFF * Forum Code is ON Smilies Hello I have the following problem: z=a+bx+cy I have a xyz-dataset and i need to find a,b,c parameter. I have no idea to solve this problem. Sould I have to do 'nonlinear implicit curve fit'? Or should I have to do 'multiple linear regression'? Then, should I need to set my 'x, y, z-dataset' as 'x1, x2, y-data' ???? Or should I need to set my 'x, y, z-dataset' as 'x, y, z-data' ???? should I need to set function type as 'equations : f=a+bx+cy-z' ??? Or should I need to set fuction type as 'LabTalk Scrip'??? But I have no idea to make a script. Also, I followed this post and I tried a lot AND failed. (POST: https://my.originlab.com/forum/topic.asp?TOPIC_ID=1734 ) Please help me. This problem is killing me. Please... Help me ASAP... Also, if you have something misunderstand, I wil explain. Thank you so much. Have a good day. leejuyeon   Check here to subscribe to this topic.