Kimmo Vehkalahti is a fellow of the Teachers' Academy, University of Helsinki, Finland. He has been a part of the faculty of Social Sciences for over 25 years, currently as senior lecturer of the Social Data Science in the Centre for Research Methods. He is author of a Finnish textbook on measurement and survey methods. The present book is his first international textbook on statistics. His research and teaching activities are related to open data science, multivariate analysis, and introductory statistics. His spare time is divided (unequally) between jogging and trail running, reading, watching ice hockey, holidays with his wife, and singing tenor in choir.
Brian S. Everitt is professor emeritus, King's College, London, UK. He worked at the Institute of Psychiatry, University of London for over 35 years, finally as head of the Biostatistics and Computing Department and professor of behavioural statistics. He is author or co-author of over 70 books on statistics and approximately 100 papers and other articles, and was a section editor for the Encyclopedia of Biostatistics, published by Wiley. In retirement, he divides his time between working as editor-in-chief of Statistical Methods in Medical Research, playing tennis, watching cricket, long walking holidays with his wife, and playing classical guitar in private.