Forest Ecosystems

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

Back to article page