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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

+

+

+

+

+

+

+