Four numeric SAS variables, Group
, Block
, Treatment
, and Rep
, are used in the input data set to define the lattice design. The Group
, Block
, and Treatment
variables are required in the data set to which PROC LATTICE is applied. For compatibility with previous releases, the third
variable can alternatively be named Treatmnt
. The Rep
variable must be present when the design involves repetition of the entire basic plan.
Group
specifies which orthogonal replication in the basic plan includes the experimental unit. Values of Group
must be , where n is the number of replicates in the basic plan.
Block
specifies the block in which the experimental unit is present. Values of Block
must be , where m is the number of blocks in a replication.
Treatment
specifies which treatment was applied to the experimental unit. Values of Treatment
must be , where i is the number of treatments in a replication.
Rep
specifies which repetition of the basic plan includes the experimental unit. Values of Rep
must be , where p is the number of replications of the entire basic plan. Thus, the experiment has a total of replicates.