Within the research project LibRank we evaluated a sample of factors for relevance ranking in library information systems by using a test system with EconBiz data. EconBiz is an academic search portal for economics by the German National Library of Economics (ZBW - Zentralbibliothek für Wirtschaftswissenschaften, Leibnitz-Informationszentrum Wirtschaft). We applied standard procedures in Information Retrieval evaluation by using human relevance assessments. The research data were obtained in three evaluation runs and are published in 3 files including: A) Search queries with descriptions; B) Document URLs with relevance assessments; C) Ranking factors and weightings.