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Table 2 Cluster-level correlations between each auxiliary variable with the other auxiliary variables and the target variables in the 1-nn population study

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

   Auxiliary data, MS-NFI-2011
All volume Pine volume Spruce volume Broadleaf volume Forested land
proportion
Auxiliary data; MS-NFI-2011 All volume 1.00 0.70 0.80 0.66 0.80
Pine volume 0.70 1.00 0.20 0.22 0.72
Spruce volume 0.80 0.20 1.00 0.48 0.45
Broadleaf volume 0.66 0.22 0.48 1.00 0.60
Forested land proportion 0.80 0.72 0.45 0.60 1.00
Target data; MS-NFI-2015 All volume 0.81 0.56 0.65 0.56 0.71
Pine volume 0.57 0.74 0.21 0.22 0.63
Spruce volume 0.61 0.18 0.72 0.42 0.38
Broadleaf volume 0.40 0.17 0.29 0.57 0.44
Age 0.69 0.73 0.35 0.39 0.81
Mean height 0.84 0.70 0.57 0.57 0.84
Mean diameter 0.83 0.71 0.55 0.54 0.83
Basal area 0.83 0.67 0.58 0.57 0.83
Age 140+ yrs. 0.10 0.16 0.02 0.00 0.13
Mineral soils 0.74 0.49 0.59 0.56 0.73
Spruce mire 0.25 0.18 0.14 0.27 0.34
Pine mire 0.07 0.39 −0.24 −0.02 0.37
  Open mire −0.10 0.00 −0.13 −0.09 −0.00