LINEAR REGRESSION:
R2 measures the goodness of fit of data to the regression equation. A perfect fit has R2 = 1.0 while the worst possible fit, i.e., completely scattered data, has R2 = 0. For established analytical methods such as spectrophotometry, specific ion, pH, you should obtain an R2 value of at least ‘four 9’s’, i.e., ( 0.9999. ................
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