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Boeklezers.nl is a network for social reading. We help readers discover new books and authors, and bring readers in contact with each other and with writers. Read more ».
Books
Observational Studies
An observational study is an empirical investigation of the effects of treatments, policies or exposures. They differ from experiments in that the investigat... »
An observational study is an empirical investigation of the effects of treatments, policies or exposures. They differ from experiments in that the investigat... »
Idea box
