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The Microsoft Excel solver add-in is one of the features that makes creating engineering and financial models in a spreadsheet a powerful tool. To be called a "solver" doesn't do it justice, though, because it is really a powerful optimization algorithm.

Excel Solver Examples and VBA Macro

http://www.vertex42.com/ExcelArticles/excel-solver-examples.html
© 2010 Alexey Pomerantsev, Oxana Rodionova

Matrix calculations in Excel

http://rcs.chph.ras.ru/Tutorials/excel_en.htm#Ch2
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Excel Tips, Excel Tutorials and Excel Examples

http://www.contextures.com/tiptech.html

Excel Sum Functions -- Sum Excel Cells

Sum a range of cells -- SUM Function The SUM function will add the numbers in a range of cells. http://www.contextures.com/xlFunctions01.html#SumProduct
Making a Second Order Fit in Excel David L. Zellmer, Ph.D. Department of Chemistry California State University Fresno April 18, 1999 http://zimmer.csufresno.edu/~davidz/Stat/LLSTutorial/SecondOrder/SecondOrder.html

Making a Second Order Fit in Excel