In the EXCEL curve fit function for a single dependant variable should the
coefficient of determination be upper case R-squared or lower case r-squared?
Excel output (Trendline and Regression tool) uses upper case R for curve
fitting with either a single X variable or multiple X variables.
Many statistics authors use lower case r for the single-X-variable
situation.
Excel's Help uses lower case r in descriptions of the RSQ and PEARSON
functions. The description of the CORREL function doesn't mention either r
or R. (PEARSON and CORREL are numerically identical.)
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