The purpose of this study is to examine the journal policies for research data sharing across a wide range of disciplines. The authors selected 22 subject areas and reviewed "Guidelines for authors" in 10 journals in each of these areas. We focused on two types of data sharing policies: (1) repository policy, where researchers deposit their data to repositories and indicate the indicate the identifier in their article, and (2) supplemental materials policy. We classified the policies into four ransk based on their strengths. In most of the subject areas in the Biological and Medical Sciences, journals tend to have a high ratio of and strong repository policies, and they recommend the same data repositories. However, only seven jounals in Agricultural Sciences, six in Pharmacology & Toxicology, and two in Psychiatry/Psychology have a repository policy. Although Geosciences, Space Science, and Social Sciences are the leading areas in data sharing, just seven, six and four jounals, respectively, have a repository policy. Only 0-2 journals have a repository policy in six other disciplines, such as Engineering. Of the 220 selected journals, 59.5% have a repository policy, whereas 89.5% have a supplemental materials policy. Journals having a description of research ethics or a disclosure for conflict of interest (COI), or published by commercial publishers tend to have a high ratio of and stronger policies. These results suggest that data sharing policies in scholarly journals are associated with scientific misconduct.
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