[2008] Topic 7: Basic Ideas of Linear Regression: The Two-Variable Model 相关

aianjie

 

AIM 1: Explain how regression analysis in econometrics measures the relationship between dependent and independent variables.

1、Joe Harris is interested in why the returns on equity differ from one company to another. He chose several company-specific variables to explain the return on equity, including financial leverage and capital expenditures. In his model:

A) return on equity is the independent variable, and financial leverage and capital expenditures are dependent variables

B) return on equity is the dependent variable, and financial leverage and capital expenditures are independent variables.

C) return on equity is the explanatory variable, and financial leverage and capital expenditure are the explained variables.

D) return on equity, financial leverage, and capital expenditures are all independent variables.

秦禹匍

核心提示↑お2012年四级考试答案▓376か849265か6月四级答案 ：4月12日，卫生部新闻发言人表示，深圳卫人委已约见肖传国，告知肖传国未经批准不得擅自开展“肖氏反射弧手术或人工体神经—内脏神经吻合术”。卫生部称，这项医疗新技术目前↑お2012年四级考试答案▓376か849265か6月四级答案 仍处于临床研究阶段，还不允许开展临床应用。
中新网4月12日电 卫生部今日举行例行发布会。卫生部新闻办公室主任、新闻发言人宋树立就华中科技大学同济医学院原泌尿外科研究所所长肖传国开办医院一事指出，深圳卫人委已约见肖传国，告知未经批准不得擅自开展“肖氏反射弧手术或人工体神经—内脏神经吻↑お2012年四级考试答案▓376か849265か6月四级答案 合术”。
宋树立说，深圳市卫生和人口计划生育委员会↑お2012年四级考试答案▓376か849265か6月四级答案 于2011年12月6日批准深圳神源医院执业登记注册，为营利性二级专科医院，设置单位的法定代表人是肖传国。经相关部门监督检查，该院2012年1月29日门诊部开业，2月22↑お2012年四级考试答案▓376か849265か6月四级答案 日住院部开业，目前还未开展“肖氏反射弧手术或人工体神经—内脏神经吻合术”。深圳卫人委已约见肖传国，告知未经批准不得擅自开展“肖氏反射弧手术或人工体神经—内↑お2012年四级考试答案▓376か849265か6月四级答案 脏神经吻合术”。
她指出，对于“肖氏反射弧手术或人工体神经—内脏神经吻合术”的有关问题，卫生部的态度是明确的，卫生部新闻发言人在2010年11月9日的例行新闻发布会上的表态没有变化，即，“目前，这个技术的安全性、有效性的循证医学证据尚不足，对这个技术是否适用于临↑お2012年四级考试答案▓376か849265か6月四级答案 床应用，还要进行充分的论证”。也就是说，这项医疗新技术目前仍处于临床研究阶段，还不允许开展临床应用。

shanshan_146

辛苦了！

dobino

[em57]谢谢楼主

binnu

顶

maliya

[em55]

aianjie

 

The correct answer is D

Ordinary least squares or OLS is a method for estimating population coefficients. It provides the line that minimizes the squared deviations of the dependent variables in the sample from the sample regression line.

aianjie

 

2、As part of a regression analysis, an analyst finds that: Y – b1 × X = -1.8 and b1 = 3.2. Based upon these results, for every unit increase in the independent variable, on average the dependent variable increases by:

A) 1.4.

B) 1.8.

C) 3.2.

D) 5.0.

aianjie

 

The correct answer is C

b1 gives the slope coefficient which indicates the average change in the dependent variable given a unit change in the independent variable.

aianjie

 

AIM 6: Define and interpret the sample regression function, regression coefficients, parameters, slope and the intercept.

Which of the following are included in a sample regression function?

?            The intercept.

?            The error term.

?            The slope coefficient.

?            The independent variable.

A) I, II, III, and IV.

B) III and IV only.

C) I and III only.

D) I, III, and IV only.