Code and data for master's thesis on quality assessment of the size property in research data repositories. Research questions: For what semantic concepts is the size property of repositories being used? What kind of quality factors can be detected when assessing the size property in a registry for research data repositories? Which automated and intellectual measures can improve the quality of the size property? Method 1: Data analysis of size and related properties over all re3data records Property selection Data extraction from API Data normalization Typing of patterns: mainly units of size Analysis: ~quantitative, mainly univariate, but also some multivariate / time [Included in the publication: Method 2: Case Study of size in individual repositories Repository selection: purposive sampling Data capture from GUI / API Analysis: ~qualitative]