This dataset accompanies the conference submission 'Journal metrics as predictors of Research Excellence Framework 2021 results: Comparison of impact factor quartiles and Finnish expert-ratings'. It contains the data in CSV format, one file per unit of analysis (Units of Assessment, Higher Education Institutions, and Subject Areas). The format of the UoA file is as follows (the other two files are analogous): institution_name: name of higher education institution (e.g. university) unit_of_assessment_name: UoA name in REF (https://www.ref.ac.uk/panels/units-of-assessment/) main_panel: main panel in REF multiple_submission_letter: blank unless submitted to multiple panels.Exceptionally HEIs may have requested permission to make two submissions from the same UoA to different panels. multiple_submission_name: blank unless submitted to multiple panels non_english: number of articles in language other than English jufo_score_uoa: JUFO score (see paper for calculation details) of UoA jif_score_uoa: JIF score (see paper for calculation details) of UoA ref_score_uoa: REF score (see paper for calculation details) of UoA