Much research on foreign aid presents claims that apply to aid in general but tests these claims using data from one or a small number of donors. This makes it difficult to know if we have learned something about aid, or merely something about one donor. For example, the literature on project aid success has found that per capita GDP growth rates or Freedom House scores in recipient countries correlate with project success. However, these claims have been tested against data from only multilateral donors and often against data from only the World Bank. I re-examine these analyses using a dataset of harmonized project outcome scores for seven diverse donors. Most donors seem to be similarly influenced by recipient-level and project-level factors, though a few notable exceptions exist. Analyses of project aid success that focus on single donors may be able to produce knowledge about aid in general.

中文翻译：

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单方捐助者对项目援助成功进行分析的结果似乎在各捐助者中普遍推广

关于外国援助的许多研究提出了一般适用于援助的主张，但使用一个或少量捐助者的数据来检验这些主张。这使得很难知道我们是否学到了一些有关援助的知识，或者仅仅是学到了有关一个捐助者的知识。例如，有关项目援助成功的文献发现，受援国的人均GDP增长率或自由之家得分与项目成功相关。但是，这些索赔仅根据多边捐助者的数据进行了检验，常常仅根据世界银行的数据进行了检验。我使用针对七个不同捐赠者的统一项目成果评分数据集来重新检查这些分析。尽管存在一些显着的例外情况，但大多数捐助方似乎也受到受援方和项目级因素的影响。