《Table 2 Number of sample plots by soil depth category and tree species used in the development of t

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

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Data from the Norwegian national forest inventory（NFI）for the period 1986–2012 were available.For all three tree species studied，steep gradients were evident in the data for the potential covariates and their combinations.This is extremely advantageous for the development of statistical models，or rather for generating generally acceptable，stable and plausible estimations of model effects（Tables 1 and 2）.