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Table 3 Cluster-level correlations between each cluster-level auxiliary variable and the other auxiliary variables in the data itself and the auxiliary data and the target variables in the field plot data 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 0.72 0.80 0.65 0.81
Pine volume 0.72 1.00 0.23 0.23 0.72
Spruce volume 0.80 0.23 1.00 0.47 0.48
Broadleaf volume 0.65 0.23 0.47 1.00 0.60
Forested land proportion 0.81 0.72 0.48 0.60 1.00
Target data; NFI field data All volume 0.82 0.57 0.67 0.53 0.69
Pine volume 0.53 0.76 0.15 0.17 0.56
Spruce volume 0.61 0.14 0.76 0.41 0.39
Broadleaf volume 0.41 0.15 0.32 0.58 0.40
Age 0.69 0.71 0.39 0.35 0.73
Mean height 0.84 0.69 0.58 0.56 0.81
Mean diameter 0.83 0.69 0.58 0.53 0.80
Basal area 0.82 0.64 0.59 0.56 0.79
Age 140+ yrs. 0.08 0.11 0.05 0.00 0.07
Mineral soils 0.72 0.48 0.58 0.54 0.72
Spruce mire 0.31 0.21 0.20 0.31 0.39
Pine mire 0.07 0.38 −0.22 −0.05 0.33
  Open mire −0.13 −0.03 −0.15 −0.11 −0.02