计量经济学第七章第
5,6,7题答案
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第7章练习5
在申请出国读学位的16名学生中有如下GRE数量与词汇分数。 数量词汇是否准入Y是否准入Y数量学生学生词汇(1=准,0=(1=准,0=成绩成绩成绩编号 编号 成绩V Q 不准) 不准) Q V 1 760 550 1 9 520 660 1 2 600 350 0 10 800 250 0 3 720 320 0 11 670 480 0 4 710 630 1 12 670 520 1 5 530 430 1 13 780 710 1 6 650 570 0 14 520 450 0 7 800 500 1 15 680 590 1 8 650 680 1 16 500 380 0 解:根据Eview软件得如下表: Dependent Variable: Y Method: ML - Binary Logit (Quadratic hill climbing) Date: 05/22/11 Time: 22:19 Sample: 1 16 Included observations: 16 Convergence achieved after 5 iterations
Covariance matrix computed using second derivatives
Variable Coefficient Std. Error z-Statistic
C Q V McFadden R-squared Mean dependent var . dependent var . of regression Akaike info criterion Sum squared resid Schwarz criterion Log likelihood Hannan-Quinn criter. Restr. log likelihood LR statistic Avg. log likelihood Prob(LR statistic)
Obs with Dep=0 7 Total obs Obs with Dep=1 9
Prob. 16 于是,我们可得到Logit模型为:
???11.107?0.004Q?0.0177V Yi () () () R2MCF?0.4685 , LR(2)=
如果在Binary estination这一栏中选择Probit估计方法,可得到如下表:
Dependent Variable: Y
Method: ML - Binary Probit (Quadratic hill climbing) Date: 05/22/11 Time: 22:25 Sample: 1 16 Included observations: 16
Convergence achieved after 5 iterations
Covariance matrix computed using second derivatives
Variable
Coefficient Std. Error z-Statistic Prob.