Definition
From the ordered list of PSUs, all possible systematic samples of 6 PSUs will be drawn to form a replicate for the most of the province domain i.e., 75 out of 81 provinces while all possible systematic samples of 8 PSUs will be drawn to form a replicate for most of the HUCs, i.e., 31 of 33 HUCs.
Small province domains such as Guimaras, Siquijor, Camiquin, Apayao, and Dinagat Islands will have 3 PSUs per replicate. Batanes with very less PSUs formed will have 3 PSUs per replicate but will be covered twice a year only (i.e., January1 and July rounds only). For other HUCs, San Juan City and Lucena City will have 3 and 5 PSUs per replicate while the other urban areas, Pateros, and City of Isabela will also have 3 PSUs per replicate while Cotabato City will be allocated with 5 PSUs per replicate.
For instance, in Cagayan with 1008 PSUs formed. A total of 1008/6 = 168 possible systematic samples of size 6 or 168 R groups or replicates can be made. The 168 replicates formed are then sorted at random so that the first 4 replicates will be in the first round, next 4 in the second round, and so on.
