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Matlab seems to be consistent and apparently uses the strict definition of R-squared in its function. I find the same values wether I get R-squared from the fit function in Matlab or I calculate it "by hand". % mean of the yobs, total sum of squares, and residual sum of squares %% here I calculate "by hand" the R-squared, from the general definition (wikipedia!) % use the fit function in Matlab, yobs being the data Here is the Matlab code I use: %% R-squared with the fit function Why Excel and Matlab don't end up with the same fitting parameters? How does Excel computes the R 2 in the 'add trendline' function, as it is obviously not the one from the definition (wikipedia)? In Matlab, using the 'fit' function, the parameters for the fitting function (and then of course the R 2) are not the ones that EXCEL has found. If I calculate it in excel using 'RSQ()' function (taking the values of the parameters Excel has found for the fitting function), or by hand using the definition (wikipedia). I plot the data, fit a power law function ('add trendline') and use the 'add trendline > options > Display R-squared value on chart' On the Number tab, click Number in the Category list, and then change the Decimal places setting to 30 or less.In short, I can't find the equations Excel uses for R 2.Double-click the trendline equation or R-squared text.Method 2: Microsoft Office Excel 2003 and earlier versions of Excel In the Category list, click Number, and then change the Decimal places setting to 30 or less.Right-click the trendline equation or the R-squared text, and then click Format Trendline Label.Open the worksheet that contains the chart.To display a greater number of digits, use one of the following methods: Method 1: Microsoft Office Excel 2007

The trendline equation and R-squared value are initially displayed as rounded to five digits. This article explains how to display more digits in the coefficients. For some purposes, this may not be a sufficient number of significant figures. When you add a trendline to a chart, and then display the equation and R-squared value for the trendline, the equation shows only the first five digits of each coefficient.