RESTRICT

The RESTRICT command is used to specify restrictions that are to be imposed in estimation. When this command is used the RESTRICT option must be specified on the estimation command. Restrictions must be linear. Restrictions cannot be used with TOBIT, LOGIT, PROBIT, or NL commands.

An example of the RESTRICT command on an OLS command is:

OLS consume income price / RESTRICT options
RESTRICT income+price=0
END