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近年来,中国林产品对外依存度不断提高,并且远远高于发达国家和发展中国家的水平。要科学合理地评价对外依存度,需要采取适当的比较对象并选择合理的评价指标体系。文中以18个主要国家的对外依存度为研究对象,依据整体性、科学性和可操作性等原则建立评价指标体系,借助SAS软件,先对影响对外依存度的各项指标进行因子分析,计算各主因子得分和综合因子得分并进行排序,然后在此基础上做聚类分析,将18个主要林业国家分为4类。
In recent years, China’s foreign dependence on forest products continues to increase, and much higher than the level of developed and developing countries. To evaluate the degree of dependence on foreign countries scientifically and reasonably, it is necessary to adopt an appropriate comparison target and select a reasonable evaluation index system. The eighteen major countries’ dependence on foreign countries is taken as the research object. According to the principle of integrity, scientificity and operability, the evaluation index system is set up. With the help of SAS software, factor analysis is first carried out on the indicators that affect the degree of dependence on foreign countries. The score of each major factor and comprehensive factor scores and sort, and then do clustering analysis based on this, the 18 major forestry countries are divided into four categories.