感谢星洁的提醒,虽然我没能比对两个版本课本的差异 不过看样子新版的第四题好像是没有数据的,题目似乎也不同 我把旧版第四题(及相关的第二题)的题目key在下面~请大家参考 请注意alpha, beta, estimate(就是头上那顶帽子)是我用来代替原本符号的作法 另外一些用英文不大能表达的我会改用中文,请大家见谅 Ex.4 Just as you are about to estimate a regression (due tomorrow), massive sunspots cause magnetic interference that ruins all electricity powered machines (e.g., computers). Instead of giving up and flunking, you decide to calculate estima- tes from your data (on per capita income in thousands of US dollars as a funct- ion of the percent of the labor force in agriculture in 10 developed countries) using methods like those used in Section 2.1.3 without a computer. Your data are: Country A B C D E F G H I J ------------------------------------------------------------------------- Income 6 8 8 7 7 12 9 8 9 10 % on farms 9 10 8 7 10 4 5 5 6 7 a. Calculate the estimate of beta 0 and the estimate of beta 1. b. Calculate R平方及调整後的R平方(R bar 平方) c. If the percentage of the labor force in agriculture in another developed country was 8 percent, what level of per capita income (in thousands of US dollars) would you guess that country had? Ex. 2 To get more practice of summation notation, use the data in Exercise 4 on Inco- me (Y) and Percent of the labor force on farms (X) to anser the following ques- tions. a. 计算X总和 b. 计算Y总和 c. 计算3X的总和,它和X总和的三倍相等吗? d. 计算X+Y的总合,它和X的总和+Y的总和相等吗? 另外,有兴趣使用SAS的同学真的可以上计中软体银行(www.cc.ntu.edu.tw)下载 学习版 以上,祝大家做作业顺利 昀昇上 --

※ 发信站: 批踢踢实业坊(ptt.cc) ◆ From: 218.166.109.216