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Table 2 Number of sample plots by soil depth category and tree species used in the development of the longitudinal height-diameter models

From: Longitudinal height-diameter curves for Norway spruce, Scots pine and silver birch in Norway based on shape constraint additive regression models

Soil depth category (only mineral soil) SD
  I (0–25 cm) II (25–50 cm) III (50–100 cm) IV (>100 cm) Sum
Norway spruce 622 1552 1203 2256 5633
Scots pine 1363 1342 653 1469 4827
Silver birch 1220 1987 1429 2516 7152