Word: statisticians
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Boasting an economist, a statistician, two psychologists, and a Government professor, the 18-member governing body of the Faculty of Arts and Sciences (FAS) is well-versed in the science of human behavior. But with the full Faculty set to discuss today the possibility of lowering the attendance required for an official vote at its general meetings, many of the professoriate’s own public policy and behavioral experts appeared torn about the effect that the proposal’s adoption might have. “If...Faculty members would only show up if there?...
...this has no business in the classroom," says Margaret Gayle, an expert on gifted education at Duke University, who has trained thousands of teachers in North Carolina. Another requirement, especially in the upper grades, is a deep knowledge of one's subject. According to research on teacher efficacy by statistician William Sanders, the higher the grade, the more closely student achievement correlates to a teacher's expertise in her field. Nationally, that's a problem. Nearly 30% of middle- and high school classes in math, English, science and social studies are taught by teachers who didn't major...
...when states are testing all students annually, there's a new, less subjective window onto how well a teacher does her job. As early as 1982, University of Tennessee statistician Sanders seized on the idea of using student test data to assess teacher performance. Working with elementary-school test results in Tennessee, he devised a way to calculate an individual teacher's contribution, or "value added," to student progress. Essentially, his method is this: he takes three or more years of student test results, projects a trajectory for each student based on past performance and then looks at whether...
...Danish statistician Bjorn Lomborg's claim that global warming will only cause us to wear "slightly fewer layers of winter clothes" is not credible. My new book Global Warming and Agriculture uses averages from six climate models and two schools of agricultural-impact models to estimate that in the absence of action, by the 2080s, global warming will reduce agricultural productivity 30% to 40% in India, 15% to 25% in Africa and Latin America, and 20% to 35% in the southern U.S. and Mexico. And if we consider the longer-term catastrophic risks from the runaway greenhouse effect, shutdown...
...Danish statistician Bjorn Lomborg's claim that global warming will only cause us to wear "slightly fewer layers of winter clothes" is not credible [Oct. 15]. My new book, Global Warming and Agriculture, uses averages from six climate models and two schools of agricultural-impact models to estimate that in the absence of action, by the 2080s global warming will reduce agricultural productivity 30% to 40% in India, 15% to 25% in Africa and Latin America and 20% to 35% in the southern U.S. and Mexico. And if we consider the longer-term catastrophic risks from the runaway greenhouse effect...