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Researchers use Nielsen Homescan data, which provide detailed food-purchase information from a panel of U.S. households, to address a variety of important research topics. However, some question the credibility of the data since the data are self-recorded and the recording process is time-consuming. Matching purchase records from 2004 Homescan data with data obtained from a large grocery retailer, it is evident that quantities purchased are reported more accurately in Homescan than are prices. Many of the price differences may be driven by the way Nielsen imputes prices: when available, Nielsen uses store-level prices instead of the actual price paid by the household. There are also differences by household type in the tendency to make mistakes that are correlated with demographic variables. However, the fraction of variance explained by the documented recording errors is in line with other research data sets for which cross-validation studies have been conducted.
"As the Stanford health economist Liran Einav and the MIT economist and MacArthur Genius Amy Finkelstein argue, our health care system was never deliberately designed, but rather pieced together to deal with issues as they became politically relevant. The result is a sprawling yet arbitrary and inadequate mess. It has left 30 million Americans without formal insurance. Many of the rest live in constant danger of losing their coverage if they lose their job, give birth, get older, get healthier, get richer, or move. It's time to tear it all down and rebuild, sensibly and deliberately. Marshaling original research, striking insights from American history, and comparative analysis of what works and what doesn't from systems around the world, Einav and Finkelstein argue for automatic, basic, and free universal coverage for everyone, along with the option to buy additional, supplemental coverage. Their wholly original argument and comprehensive blueprint for an American universal health insurance system will surprise and provoke."--Publisher marketing.
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