Block Partition Variable Use this field to specify the name of a variable in the Input SAS Data Set that indicates the specific blocks to use for the Block Partition Hold-Out Method. Each distinct level of this variable will form a different hold-out block. The values of this variable must be positive integers (1, 2, 3, and so on). To Specify the Block Partition Variable: Specify Block Partition as the Hold-Out Method to activate the Block Partition Variable field. Type the name of the desired variable in the text field.