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Table 1 Population values for auxiliary and target variables in the study region in the 1-nn population and the field plot population. The target is derived from the MS-NFI-2015 map for the 1-nn population and from the NFI field measurements for the field plot population

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

  

Unit

1-nn population

Field plot population, NFI measurements

Auxiliary variable; MS-NFI-2011

All volume

m3∙ha−1

130.8

131.1

Pine volume

m3∙ha−1

55.6

55.6

Spruce volume

m3∙ha−1

46.7

46.9

Broadleaf volume

m3∙ha−1

28.5

28.5

Forested land proportion

%

85.6

82.4

   

MS-NFI-2015

NFI field

Target variable

All volume

m3∙ha−1

136.0

136.0

Pine volume

m3∙ha−1

56.3

57.2

Spruce volume

m3∙ha−1

50.3

50.6

Broadleaf volume

m3ha−1

29.7

28.5

Age

years

51.8

40.1

Mean height

dm

140.0

140.0

Mean diameter

cm

16.1

16.0

Basal area

m2∙ha−1

17.4

17.4

Age 140+ yrs.

%

1.4

0.7

Mineral soils

%

63.3

60.8

Spruce mire

%

8.8

9.1

Pine mire

%

13.5

12.9

Open mire

%

1.2

1.4