{"product_id":"9781441931917","title":"Observational Studies","description":"An Observational study is an empiric investigation of the effects caused by a treatment, policy , or intervention in which it is not possible to assign subjects at random to treatment or control, as would be done in a controlled experiment. Observational studies are common in most fields that study the effects of treatments on people.\u003cp\u003eThe second edition of \"Observational Studies\" is about 50 percent longer than the first edition, with many new examples and methods. There are new chapters on nonadditive models for treatment effects (Chapter 5) and planning observational studies (Chapter 11) and Chapter 9, on coherence, has been extensively rewritten.\u003c\/p\u003e\u003cp\u003e Paul R. Rosenbaum is Robert G. Putzel Professor, Department of Statistics, The Wharton School of the University of Pennsylvania. He is a fellow of the American Statistical Association.\u003c\/p\u003e\u003cp\u003e  \u003c\/p\u003e","brand":"Springer New York","offers":[{"title":"Default Title","offer_id":47054452818160,"sku":"9781441931917","price":199.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0737\/7593\/9824\/files\/9781441931917_p0.jpg?v=1763809192","url":"https:\/\/shop-qa.barnesandnoble.com\/products\/9781441931917","provider":"Barnes \u0026 Noble (DEV)","version":"1.0","type":"link"}