Data for analysis in "A tipping point for open citation data"

Metadata used for the analysis in the article "A tipping point for open citation data" appearing in Quantitative Science Studies, 2021. Metadata were adapted from the NIH Open Citation Collection (NIH-OCC, https://doi.org/10.1371/journal.pbio.3000385) and the PubMed Knowledge Graph (PKG, https://doi.org/10.1038/s41597-020-0543-2).The NIH-OCC, for which a more recent update is available than the PKG, was truncated at the max PubMed Identifier (PMID) found in the PKG, to ensure the comparison of the two covers the same range of articles.nihocc_and_pkg.csv.gz: Gzipped citations from the NIH-OCC that were also found in the PKG (2 columns, citing PMID followed by referenced PMID)nihocc_not_pkg.csv.gz: Gzipped citations from the NIH-OCC that were not found in the PKG (2 columns, citing PMID followed by referenced PMID)pkg_not_nihocc.csv.gz: Gzipped citations from the PKG that were not found in the NIH-OCC (2 columns, citing PMID followed by referenced PMID)The paper describing the PKG is provided under a CC-BY 4.0 license, and Creative Commons Public Domain Dedication applies to the metadata files associated with that article https://doi.org/10.1038/s41597-020-0543-2). The paper describing the NIH-OCC and the NIH-OCC itself are both public domain (https://icite.od.nih.gov).