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By Charles Flock on 4/14/2019 9:47 AM
Multiple Linear Regression (aka Ordinary Least Squares) usually calculates the best fit for a series of independent x-value and dependent y-values. Most of these linear systems have more rows than columns which will generate a unique solution. Those systems are called overdetermined systems. In this article, we look at underdetermined systems (where the number of rows is less than the number columns) and compare how they are handled in XLeratorDB, Excel, Google Sheets, and R. You will be surprised at what we discovered.
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