Editing Coefficient of determination (section)

=== Caveats ===
''R''<sup>2</sup> does not indicate whether:
* the independent variables are a cause of the changes in the [[dependent variable]];
* [[omitted-variable bias]] exists;
* the correct [[regression analysis|regression]] was used;
* the most appropriate set of independent variables has been chosen;
* there is [[Multicollinearity|collinearity]] present in the data on the explanatory variables;
* the model might be improved by using transformed versions of the existing set of independent variables;
* there are enough data points to make a solid conclusion;
* there are a few [[outlier]]s in an otherwise good sample.
[[File:Thiel-Sen estimator.svg|thumb|Comparison of the [[Theil–Sen estimator]] (black) and [[simple linear regression]] (blue) for a set of points with [[outlier]]s. Because of the many outliers, neither of the regression lines fits the data well, as measured by the fact that neither gives a very high ''R''<sup>2</sup>.]]