{"product_id":"9781071950340","title":"Modeling Nonlinearity and Interaction in Regression Analysis Using Spline Variables by Roger A. Wojtkiewicz","description":"This volume addresses the issue of linear constraints in regression modeling. Author Roger A. Wojtkiewicz uses the method of knotted spline variables (also known as piecewise linear regression) and a new method involving group spline variables to model nonlinearity in a variety of situations. Using spline variables to model nonlinearity allows researchers to specify unrestricted models for models that involve interval variables, allowing for greater flexibility in modeling any possible interaction.\u003cbr\u003eBinding: Paperback \/ softback","brand":"Gardners","offers":[{"title":"Default Title","offer_id":56296349696373,"sku":"9781071950340","price":36.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/7193\/3106\/files\/9781071950340.jpg?v=1762771134","url":"https:\/\/backstory.london\/products\/9781071950340","provider":"Backstory","version":"1.0","type":"link"}