RT Book T1 Design and interpretation of studies: relevant concepts from the past and some extensions A1 Cox, D. R. A2 Wermuth, Nanny LA English YR 2015 UL https://krimdok.uni-tuebingen.de/Record/1866304488 AB Principles for the planning and analysis of observational studies, as suggested by W.G Cochran in 1972, are discussed and compared to additional methodological developments since then.Comment: 6 page K1 Research