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Fearing that the police would recognize him, he never went out during day time.
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更多“Fearing that the police would …”相关的问题
参考例13.9并利用CRIME4.RAW中的数据。
(i)假定你在做差分以消除非观测效应后， 认为
log(pol pc)与log(crm rte) 是同时决定的; 特别是犯罪的增加与警察人数的增加有关。这对解释方程(13.33)中log(pol pc) 的正系数有何帮助？
(ii)变量tca pc表示全县人均征税量。将它排除在犯罪方程之外看上去合理吗？
(iii)在包括了潜在的工具变量log(tap c)后， 利用混合OLS估计log(pol pc) 的约简型。log(tax pc) 看起来是一个很好的备选IV吗？
(iv)假设在几年后，北卡罗来纳州资助某些县扩大其警察规模。你如何利用这个信息估计增加的警察对犯罪率的影响？
However, three days later, a letter arrived, calling me to Croydon for a meeting with the headmaster. It was clearly the headmaster himself __2__ open the door. He was short and round.
"The school," he said, "is made up of one class of twenty-four boys between seven and thirteen." I should have to teach all the subjects except art, which he taught himself. I should have to divide the class into three groups and teach them in turn at three different __3__. And I was disappointed at the thought of teaching maths, a subject at which I wasn't very good at school. Worse perhaps was the idea of __4__ to teach them on Saturday afternoon because most of my friends would be enjoying themselves at that time.
Before I had time to ask about my salary, he got up to his __5__. "Now," he said, "you'd better meet my wife. She is the one who really runs this school."
1)、A.that
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2)、A.that
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3)、A.that
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E.levels
4)、A.that
B.experience
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5)、A.that
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