external validity

The single subject research is one of the useful methods in the research of special children's psychology and education, but its external validity often receives challenges.

单一被试实验是特殊儿童心理与教育研究中的一种常用方法，但其外部效度往往受到质疑。2实验结果的外部效度需要进一步验证。

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It also uses a method of a group of cases, in which each case may present its individual characters, as well as show the common trend when combined with other cases, so the better external validity of the study could be obtained.

研究还采纳个案组合研究方式，在这种方式中每一个案既显示自己独特之处，又可与其它个案结合一起以检验共同趋势，这样来获得更佳的外部效度。

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Interest in historical methods had arisen less through external challenge to the validity of history as an intellectual discipline and more from internal quarrels among historians themselves.

译文：人们对历史研究方法产生了兴趣，这与其说是因为外部对历史作为一门知识学科的有效性提出了挑战，还不如说是因为历史学家内部发生了争吵。

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The research found that the validity of new indexes like external links in particular domains may be better than that of total external link.

本文的研究发现，将外部链接限制在专门的网域后所产生的一些新的计量指标，其有效性可能比总外部链接的有效性更好。

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Internal validity concerns the only explanation of the results, and the external validity concerns the generalizability of the results.

内部效度与所得结果的唯一解释性有关，外部效度与结果的可推广性有关。

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Chapter III makes a study on the content of the assignment contract, also it makes a research in a full scale on the legal relations between the assignor, the assignee and the debtor and on the internal and external legal validity of the assignment contract.

第三章对债权让与合同的内容，让与人、受让人与债务人之间的法律关系及让与合同的内外部法律效力进行了深入研究。

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