Advances in Information Retrieval: 42nd European Conference on IR Research, ECIR 2020, Lisbon, Portugal, April 14–17, 2020, Proceedings, Part II

s of the IR Journal Papers A Comparison of Filtering Evaluation Metrics Based on Formal Constraints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 855 Enrique Amigó, Julio Gonzalo, Felisa Verdejo, and Damiano Spina How Do Interval Scales Help Us with Better Understanding IR Evaluation Measures? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 856 Marco Ferrante, Nicola Ferro, and Eleonora Losiouk The Impact of Result Diversification on Search Behaviour and Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 857 David Maxwell, Leif Azzopardi, and Yashar Moshfeghi On the Impact of Group Size on Collaborative Search Effectiveness . . . . . . . 859 Felipe Moraes, Kilian Grashoff, and Claudia Hauff Fewer Topics? A Million Topics? Both?! On Topics Subsets in Test Collections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 860 Kevin Roitero, J. Shane Culpepper, Mark Sanderson, Falk Scholer, and Stefano Mizzaro Neural Architecture for Question Answering Using a Knowledge Graph and Web Corpus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 861 Uma Sawant, Saurabh Garg, Soumen Chakrabarti, and Ganesh Ramakrishnan Evaluation Measures for Quantification: An Axiomatic Approach . . . . . . . . . 862 Fabrizio Sebastiani Overcoming Low-Utility Facets for Complex Answer Retrieval . . . . . . . . . . 863 Sean MacAvaney, Andrew Yates, Arman Cohan, Luca Soldaini, Kai Hui, Nazli Goharian, and Ophir Frieder xxxviii