The HPFOREST Procedure

The ID statement lists one or more variables from the input data set that are transferred to the output data set that is specified in the SCORE statement. By default, high-performance analytical procedures do not include all variables from the input data set in output data sets.

The ID statement is optional. However, when you are running in distributed mode or with concurrent threads, the SCORE statement rearranges the observations. An ID variable is needed to correctly merge the output data with other variables from the input data set.