作者dick0631 (立志打败邪恶的ETS军团)
看板Statistics
标题Re: [问题] 这题不会...请高手帮忙解答
时间Fri Nov 30 00:35:26 2007
※ 引述《Eath1119 (天山肥黑龙)》之铭言:
: Consider an equation to explain salaries of CEOs in terms of annual firm
: sales, return on equity (roe, in % form), return in firm stocks ( ros, in %
: firm):
: 假设有个式子可以解释CEO的年度销售薪水, 回报在股票 (roe, 用%的方式表示)以及公司
: 配股 firm stock (ros, 用%表示):
: log (salary): β0 +β1log(sales) +β2roe +β3ros+u
: (1) In terms of model parameters, state the null hypothesis that, after
: controlling for sales and roe, ros has no effect on CEO salary. State the
: alternative that better stock market performance increases a CEO’s salary.
: 在变数模式中, 设定虚无假设.在控制销售以及roe和ros之後,并不会影响CEO的薪水. 请
: 找出相对的好的股市表现以增加CEO的薪水
我觉得,若你无法确定可以翻译的很正确,到不如就po原文吧!
after controlling for sales and roe, ros has no effect on CEO salary.
:这是说,在控制了sales和roe後,ros并不影响CEO的薪水,也就是ros不显着地影响
salary.
所以H_0:beta_3=0.
接着,你要去做一个逻辑叙述,为什麽stock market performance和CEO的薪水有正相关。
(2) using the data in CEOSAL1.RAW, the following equation was obtained by OLS
: 根据CEOSAL1.RAW,下列公式根据OLS成立:
: log(salary)= 4.32 + 2.80 log(sales) + 0.174 roe + 0.00024 ros
: ( 0.32) (0.035) (0.0041) (0.00054)
: n=209, R^2 =0.283
: , by what percentage is salary predicted to increase if ros increases by 50
: points? Does ros have a practically large effect on salary?
: 当ros增加50个unit,薪水的涨幅预计会是多少? 根据得出的结果,ros对薪水的影响相对比
: 较大吗?
这应该是基本的吧!0.00024*50
: (3) Test the null hypothesis that ros has no effect on salary against the
: alternative that ros has a positive effect. Carry out the test at the 10%
: significance level.
: 试验两个假设: 一,若ros对CEO薪水没有影响, 相对於此,另试验ros对CEO 薪水有正面影
: 响. 试验数据: 以10%为准
参考(1),用t-test
: (4) Would you include ros in a final model explaining CEO compensation in
: terms of firm performance? Explain.
: 在用最後根据公司表现解释CEO薪水时,你会不会将ros 包括在最後模型里?请解释
: 感激不尽,兄弟初学统计,很多东西实在搞不懂!
参考(1)和(3)。
不能每一题都给你答案,这对你没有帮助。
请参考Stock and Waston写的introductory to econometrics,对你应该很有帮助。
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