Discussion - Should we create a RegressionInterface?

[Beakerboy]

Adding an interface to the parent Regression class would force all non-abstract children of Regression to implement certain methods in a particular way. For example, we will want to ensure that they all have an evaluate() and calculate() method. A non-parametric algorithm like LOESS would not have a defined equation, or parameters. If they (getEquation() or getParameters()) were part of the Interface, the parent would have to implement them and return some sort of error.