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Table 2 Relative RMSE and bias (in brackets) values of the forest attributes in three study stands

From: Inventory of aspen trees in spruce dominated stands in conservation area

Stand Sampling rate (%) Sampling alternative Number of plots RMSE (%) (bias %)
V N D g M N dbh >25cm
1 2.48 Random 5 62.0 (–3.4) 64.3 (–5.0) 56.9 (–10.6) 81.8 (–2.4)
  4.97 Random 10 43.8 (–3.3) 45.6 (–2.9) 35.2 (–6.0) 58.2 (–3.5)
  7.45 Random 15 35.2 (0.6) 36.2 (0.2) 23.5 (–3.6) 47.7 (–0.5)
  9.94 Random 20 30.5 (–1.4) 31.0 (–1.2) 15.5 (–2.1)) 41.8 (–2.1)
   Systematic 5 50.8 (–3.0) 56.0 (–4.4) 48.2 (–6.8) 74.3 (–1.2)
   Systematic 10 34.5 (–0.1) 40.1 (–1.4) 35.8 (–6.1) 48.5 (0.1)
   Systematic 15 25.9 (–2.3) 21.5 (–1.5) 17.8 (–1.8) 49.7 (–4.2)
   Systematic 20 24.5 (–1.8) 25.5 (–1.2) 13.5 (–2.5) 38.5 (–2.8)
2 3.36 Random 5 85.7 (–0.2) 83.8 (0) 29.4 (1.3) 87.1 (–0.8)
  6.72 Random 10 59.8 (1.2) 59.7 (0.6) 24.5 (–1.4) 60.6 (0.2)
  10.08 Random 15 50.0 (–0.2) 49.2 (0) 21.1 (–1.3) 50.1 (–0.2)
  13.45 Random 20 41.8 (0.7) 42.7 (–0.6) 18.7 (–0.4) 42.8 (–0.1)
   Systematic 5 84.4 (–3.8) 98.2 (–8.2) 28.6 (0.9) 91.9 (–5.9)
   Systematic 10 53.2 (0) 47.6 (–2.4) 23.6 (–0.6) 52.2 (–1.4)
   Systematic 15 37.6 (1.4) 38.3 (–0.5) 18.5 (–0.3) 42.2 (0.5)
   Systematic 20 30.6 (0.1) 31.1 (–0.6) 16.9 (–0.2) 34.6 (–0.3)
3 1.55 Random 5 51.1 (0.2) 64.5 (–0.5) 21.0 (0.5) 52.8 (–0.1)
  3.09 Random 10 36.0 (–0.2) 46.3 (–1.8) 13.1 (0.5) 37.7 (–0.7)
  4.64 Random 15 29.0 (–0.5) 37.3 (–1.0) 10.1 (–0.1) 30.1 (–0.5)
  6.18 Random 20 25.2 (0.1) 31.7 (–0.8) 8.5 (0.1) 25.6 (0.2)
   Systematic 5 53.6 (–1.2) 58.4 (2.9) 18.5 (0.5) 52.9 (–0.5)
   Systematic 10 33.6 (–0.4) 35.5 (–0.7) 12.8 (–1.6) 36.4 (–0.6)
   Systematic 15 26.7 (0) 29.8 (–0.7) 7.7 (–0.2) 24.2 (0)
   Systematic 20 33.8 (0.1) 35.7 (0.4) 7.2 (–0.5) 31.9 (–0.2)