PROC ORTHOREG <options> ;

The PROC ORTHOREG statement has the following options:


specifies the input SAS data set to use. By default, the procedure uses the most recently created SAS data set. The data set specified cannot be a TYPE=CORR, TYPE=COV, or TYPE=SSCP data set.


suppresses the normal display of results. This option temporarily disables the Output Delivery System (ODS); see Chapter 20, Using the Output Delivery System for more information.


specifies the order in which to sort the levels of the classification variables (which are specified in the CLASS statement). This ordering determines which parameters in the model correspond to each level in the data, so the ORDER= option may be useful when you use ESTIMATE statement. This option applies to the levels for all classification variables, except when you use the (default) ORDER=FORMATTED option with numeric classification variables that have no explicit format. With this option, the levels of such variables are ordered by their internal value.

The ORDER= option can take the following values:

Value of ORDER=

Levels Sorted By


Order of appearance in the input data set


External formatted value, except for numeric variables with no explicit format, which are sorted by their unformatted (internal) value


Descending frequency count; levels with the most observations come first in the order


Unformatted value

By default, ORDER=FORMATTED. For ORDER=FORMATTED and ORDER=INTERNAL, the sort order is machine-dependent.

For more information about sorting order, see the chapter on the SORT procedure in the Base SAS Procedures Guide and the discussion of BY-group processing in SAS Language Reference: Concepts.


produces an output data set that contains the parameter estimates, the BY variables, and the special variables _TYPE_ (value "PARMS"), _NAME_ (blank), and _RMSE_ (root mean squared error).


specifies a singularity criterion for the inversion of the triangular matrix . By default, SINGULAR=10E12.