Importance value (i.v.) of covariates calculated as the number of times each variable was selected for splitting, weighted by the squared improvement to the model as a result of each split, averaged over all trees, and rescaled to sum to 100 for proportion of weeds and noxious species.
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数据链接：
https://figshare.com/articles/dataset/_Importance_value_i_v_of_covariates_calculated_as_the_number_of_times_each_variable_was_selected_for_splitting_weighted_by_the_squared_improvement_to_the_model_as_a_result_of_each_split_averaged_over_all_trees_and_rescaled_to_sum_to_100_for_proportion_of_/454748数据链接链接失效反馈
官方服务：
资源简介：
Covariates with importance values <2% are not included. Trend indicates whether the relationship with taxonomic groups is positive or negative.
创建时间：
2011-04-11
