The FOREST Procedure

OUTPUT Statement

OUTPUT OUT=CAS-libref.data-table <option>;

The OUTPUT statement creates an output data table that contains the results of PROC FOREST.

You must specify the following option:

OUT=CAS-libref.data-table

names the output data table for PROC FOREST to use. You must specify this option before any other options. CAS-libref.data-table is a two-level name, where

CAS-libref: refers to a collection of information that is defined in the LIBNAME statement and includes the caslib, which includes a path to where the data table is to be stored, and a session identifier, which defaults to the active session but which can be explicitly defined in the LIBNAME statement. For more information about CAS-libref, see the section Using CAS Sessions and CAS Engine Librefs.
data-table: specifies the name of the output data table.

You can also specify the following options:

COPYVAR=variable COPYVARS=(variables)

lists one or more variables from the input data table to be transferred to the output data table.

ROLE<=name>

generates a numeric variable that indicates the role played by each observation in fitting the model. By default, the variable is named _ROLE_. You can add an optional =name to change the name of this generated variable. For each observation, the interpretation of this variable is shown in Table 5.

Table 5: Role Interpretation

Value	Observation Role
0	Not used
1	Training
2	Validation
3	Testing

If you do not partition the input data by using a PARTITION statement, then the value of the role variable is 1 for all observations.

Last updated: December 09, 2022