Trying to "FIND THE BEST FUNCTION" A + B + C + D = SomeResult Thanks for reading my question. Hello, I am writing my own computer program. I found this forum while searching Google. I need to "Find the Best Function" given a dataset. It looks like this EXAMPLE: A B C D RESULT 9 8 7 7 864.3 7 7 7 7 794.3 8 7 6 6 775.4 7 6 7 7 772.7 6 7 7 7 772.7 6 6 7 7 751.1 In other words, I have the values A B C D and I know what there result should be. Now I just need an excel equation to predict the result. I put the excel file with the data here http://www.mediafire.com/?itm5jgxyldz [Broken] I've never done this before. I found this other program called FindGraph http://www.uniphiz.com/findgraph.htm which you can download for free there. I think it will give me what I want. But i dont know enough about math to get it to work. Any nudge someone can give me in the right direction would be great! Thanks!