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https://www.ncl.ac.uk/webtemplate/ask-assets/external/maths-resources/statistics/regression-and-correlation/coefficient-of-determination-r-squared.html
Coefficient of Determination, R-squared
R 2=1−sum squared regression (SSR)total sum of squares (SST),=1−∑(yi−^yi)2∑(yi−¯y)2. R ...
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