Methods Attribution approach or factor analysis, causal analysis and induction were adopted.
方法主要采用归因法或因子分析法、因果分析和归纳法。
In the chart of causal analysis of important degree, we may directly see taxis of each influence factor and conveniently find out main influence factors.
从重要度因果分析图，可以直观地看出各个影响因素的排序，方便地找出其主要影响因素。
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