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Table 4 Combinations of cluster-level auxiliary variables utilized with the LPM designs. The ‘+’ sign indicates the variables included to the design

From: Comparison of the local pivotal method and systematic sampling for national forest inventories

Sampling design Coordinates All volume Pine volume Spruce volume Broadleaf volume Forested land proportion
X Y
LPMxy + +      
LPMvp + + +     +
LPMspruce + + +   +   +
LPMpine + + + +    +
LPMbl + + +    + +
LPMall + + + + + + +