本文在现有的信用评级法指标体系基础上，运用主成分分析法定量筛选评价指标，克服指标选取的主观性。
Based on the current index system of credit rating, we use Principal Component Analysis to filtrate the index quantitatively, overcoming the subjectivity of index selection.
在去年的一项研究中，国际货币基金组织称评级是评价一个主权国家是否存在违约风险的一个相当好的指标。
In a study last year, the International Monetary Fund concluded that ratings were a reasonably good indicator of sovereign -default risk.
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