Formula
In the Formula field, enter a formula specifying the desired model. In its simplest form a formula consists of the response variable, a tilde (~), and a list of predictor variables separated by "+"s. An intercept is automatically included by default. For example: Fuel ~ Weight + Disp. fits a regression model with Fuel as the response and Weight and Disp. as predictors.
You can also click the Create Formula button to open a formula builder dialog used to construct a formula specifying the desired model. See the online Help section Building Formulas for more information.