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Table 7 Variables included in the productivity model, including their type and variable importance

From: Predicting current and future suitable habitat and productivity for Atlantic populations of maritime pine (Pinus pinaster Aiton) in Spain

Type Variable Normalized importance Relative importance Summarized values for suitable habitat
Mean Max Min SD
Lithostratigraphy LIT_dlo1 51.24 100.00
Geology Geo_es1 24.13 43.16
Soil R 6.31 5.80 16.02 43.00 1.00 5.48
Climate BIO03 6.17 5.52 3.94 4.40 3.60 0.14
Soil CEC 4.71 2.45 25.04 66.00 15.00 2.82
Soil WRB-LEV11 3.89 0.72
Climate BIO08 3.54 0.00 8.59 12.50 2.60 1.64
  1. To ensure values of variable importance were expressed on a comparable scale for each of the response variable, the scores of all the predictors selected were normalized so that they added up to a unitary value (normalized importance) or were expressed as relative values. Relative importance = (VIM−VIMmin)/(VIMmax−VIMmin)
  2. 1Qualitative variables