The issue of open access (OA) to scientific publications is attracting growing interest within the scientific community and among policy makers. Open access indicators are being calculated. In its 2019 ranking, the “Centre for Science and Technology Studies” (CWTS) provides the number and the share of OA publications per institution. This gives an idea of the degree of openness of institutions. However, not taking into account the disciplinary specificities and the specialization of institutions makes comparisons based on the shares of OA publications biased. We show that OA publishing practices vary considerably according to discipline. As a result, we propose two methods to normalize OA share; by WoS subject categories and by disciplines. Normalized Open Access Indicator (NOAI) corrects for disciplinary composition and allows a better comparability of institutions or countries.

中文翻译：

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衡量开放获取出版物：一种新颖的标准化开放获取指标

科学出版物的开放获取 (OA) 问题正在吸引科学界和政策制定者越来越多的兴趣。正在计算开放获取指标。在 2019 年的排名中，“科学技术研究中心”(CWTS) 提供了每个机构的 OA 出版物数量和份额。这给出了机构开放程度的概念。然而，没有考虑学科的特殊性和机构的专业化，基于开放获取出版物的份额进行比较是有偏见的。我们表明，OA 出版实践因学科而异。因此，我们提出了两种标准化 OA 份额的方法；按 WoS 学科类别和学科。