Even as you read this, new monsters are being made, new items crafted, and dungeons overflowing with horrible surprises are being designed to test your bravery and intellect.1 1.Were the study groups comparable and representative of large employers?Chernew et al. employed a "quasi-experimental" difference-indifference design, in which MPRs for Employer A, which implemented the pharmacy benefit cost-share decrease, were Making the World Safe for Evidence-Based Policy: Let's Slay the Biases in Research on Value-Based Insurance Design
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Fairman et al. (2008) studied this question.