3.1.1-1信息检索效果评价指标

检索效果（retrieval effectiveness）是指检索系统检索的有效程度，它反映检索系统的能力。也涉及实施检索的人所能发挥检索系统的最大能力、效益等因素。包括6个评价指标：收录范围、查全率、查准率、响应时间、用户负担及输出形式。其中两个主要的衡量指标是查全率（Recall ratio）和查准率（Precision ratio），分别用R和P大写字母表示。

安兴茹,周咏仪.检索效果评价的数学模型研究[J].情报杂志,2007(1):61-63,66. 该文论述部分见其参考文献：张保明.集合的重合度与检索效果评价指标[J].情报学报,1982,1(1):44-49. 该文涉及到的部分内容见其参考文献：Lancaster F. W. Evaluation and testing of information retrieval systems，Encyclopedia of library and information science,1972(8):234-25. 笔者在“百链云图书馆”（网址：http://www.blyun.com/）在“标题”中输入：Evaluation and testing of information retrieval systems，出现结果有5个。其中有一篇论文：CYRIL CLEVERDON.Evaluation Tests of Information Retrieval Systems. Journal of Documentation, 1970, 26(1): 55-67，可以通过邮件传递得到全文。也有的说是: Cyril W. Cleverdon published early findings of the Cranfield studies, developing a model for IR system evaluation. See: Cyril W. Cleverdon, "Report on the Testing and Analysis of an Investigation into the Comparative Efficiency of Indexing Systems". Cranfield Collection of Aeronautics, Cranfield, England, 1962.见：python_backup. Information retrieval信息检索. https://www.cnblogs.com/webRobot/p/6047720.html，但本文没有考证。

不过，在Evaluation Tests of Information Retrieval Systems原文中，应该是通过emerald下载的原文，第一页提到，下载该篇论文的用户一般也会下载如下论文：（1）C.W. CLEVERDON, (1974),"USER EVALUATION OF INFORMATION RETRIEVAL SYSTEMS", Journal of Documentation, Vol. 30 Iss 2 pp. 170-180. http://dx.doi.org/10.1108/eb026574; (2)CYRIL CLEVERDON, (1967),"The CRANFIELD TESTS ON INDEX LANGUAGE DEVICES", Aslib Proceedings, Vol. 19 Iss 6 pp. 173-194 http://dx.doi.org/10.1108/eb050097. (3)CYRIL W. CLEVERDON, (1972),"ON THE INVERSE RELATIONSHIP OF RECALL AND PRECISION",

Journal of Documentation, Vol. 28 Iss 3 pp. 195-201 http://dx.doi.org/10.1108/eb026538。

另外，该文提到：查全率和查准率是Perry和Kent在1957年提出的。原文如下：The two most widely used measures, recall ratio and precision ratio, have become known as the 'Cranfield Measures' although they were originally proposed by Perry and Kent in 1957.（最广泛使用的两个度量，查全率和差准率，虽然最初是由Perry和Kent在1957年提出的，但是它们被称为Cranfield度量。） 见：PERRY, J. W. and KENT, A. Documentation and information retrieval. Western Reserve University, 1957.