The HPQLIM Procedure

ENDOGENOUS Statement

Censored Variable Options
Truncated Variable Options
Stochastic Frontier Variable Options

ENDOGENOUS variables $\sim$ options ;

The ENDOGENOUS statement specifies the type of dependent variables that appear on the left-hand side of the equation. The listed endogenous variables refer to the dependent variables that appear on the left-hand side of the equation. Currently, no right-hand side endogeneity is handled in PROC HPQLIM. All variables that appear on the right-hand side of the equation are treated as exogenous.

Censored Variable Options

CENSORED (censored-options )

specifies that the endogenous variables in this statement be censored. You can specify the following censored-options:

LB=value |variable LOWERBOUND=value |variable: specifies the lower bound of the censored variables. If value is missing or the value in variable is missing, no lower bound is set. By default, no lower bound is set.
UB=value |variable UPPERBOUND=value |variable: specifies the upper bound of the censored variables. If value is missing or the value in variable is missing, no upper bound is set. By default, no upper bound is set.

Truncated Variable Options

TRUNCATED (truncated-options )

You can specify the following truncated-options:

LB=value |variable LOWERBOUND=value |variable: specifies the lower bound of the truncated variables. If value is missing or the value in variable is missing, no lower bound is set. By default, no lower bound is set.
UB=value |variable UPPERBOUND=value |variable: specifies the upper bound of the truncated variables. If value is missing or the value in variable is missing, no upper bound is set. By default, no upper bound is set.

Stochastic Frontier Variable Options

FRONTIER <(frontier-options )>

You can specify the following frontier-options:

TYPE=HALF |EXPONENTIAL |TRUNCATED

specifies the model type.

HALF: specifies half-normal model.
EXPONENTIAL: specifies exponential model.
TRUNCATED: specifies truncated normal model.

PRODUCTION

specifies that the estimated model be a production function.

COST

specifies that the estimated model be a cost function.

If neither PRODUCTION nor COST is specified, a production function is estimated by default.