The new method USES reference portfolio formed on the base of corporation market value to calculate long-run abnormal returns, USES adjusted-t test or rank test to test abnormal returns.
改进的长期异常回报率计算方法是基于市值的参考组合法，改进的检测方法是偏度矫正的t检验法和秩和法。
The test result has showed that the water content of this CRM is low, it is homogeneous and stable, its certified value is creditable and it can be used as second-rank certified reference material.
实验结果表明，该标准物质含水量低，均匀稳定，定值可信，可作为二级标准物质使用。
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