AU - Dimick J FAU - Dimick, Justin B. AU - Ryan A FAU - Ryan, Andrew M. AU - Livingston E FAU - Livingston, Edward H. AU - Lewis R FAU - Lewis, Roger J. TI - Methods for Evaluating Changes in Health Care Policy—The Difference-in-Differences Approach PT - BOOK SECTION DP - 2019 BTI - JAMA Guide to Statistics and Methods DA - 2019 Y2 - 2024/04/25 UR - jamaevidence.mhmedical.com/content.aspx?aid=1184194809