User`s guide

3 Fitting Data
3-40
Therefore, you would conclude that more data must be collected before you can
make accurate predictions using a fifth-degree polynomial.
In conclusion, you should examine all available goodness of fit measures before
deciding on the best fit. A graphical examination of the fit and residuals should
always be your initial approach. However, some fit characteristics are revealed
only through numerical fit results, statistics, and prediction bounds.