`MODEL`

dependent = effects / options ;

The MODEL statement specifies the regression model. The keyword MODEL is followed by the dependent variable name, an equal sign, and a list of independent effects. Only one MODEL statement is allowed.

Every variable in the model must be a numeric variable in the input data set. Specify an independent effect with a variable name optionally followed by a polynomial lag distribution specification.

The general form of an effect is

`variable ( length, degree, minimum-degree, constraint )`

The term in parentheses following the variable name specifies a polynomial distributed lag (PDL) for the variable. The PDL specification is as follows:

*length*-
specifies the number of lags of the variable to include in the lag distribution.

*degree*-
specifies the maximum degree of the distribution polynomial. If not specified, the degree defaults to the lag length.

*minimum-degree*-
specifies the minimum degree of the polynomial. By default

*minimum-degree*is the same as*degree*. *constraint*-
specifies endpoint restrictions on the polynomial. The value of

*constraint*can be FIRST, LAST, or BOTH. If a value is not specified, there are no endpoint restrictions.

If you do not specify the *degree* or *minimum-degree* parameter, but you do specify endpoint restrictions, you must use commas to show which parameter, *degree* or *minimum-degree*, is left out.

The following options can appear in the MODEL statement after a slash (/).