CAPM模型在资本市场的有效性检验
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证券投资分析作业
CAPM模型在中国资本市场的有效性检验
1、数据选取
此次实验主要考察CAPM模型在中国电力行业是否适用,因此随机抽取了电力行业的十只股票(时间段为2010年1月1日—2010年12月31日),分别为
选取沪深300指数为综合指数,选取2010年的国债的利率作为无风险资产的收益率(0.025)。
2、β系数的确定
CAPM模型中,β系数可以表述为:Ri–Rf=αi+βi(Rm-Rf)+εi,其中Ri为每一种证券的收益率,Rf为无风险收益率,Rm为市场收益率。
使用Eviews软件对每只股票每日风险溢价与市场组合风险溢价进行回归,得到每只股票的β值。如下:
(1)黔源电力
DependentVariable:Y
Method:LeastSquares
Date:12/26/11Time:16:35
Sample:1241
Includedobservations:241
Variable Coefficie
nt Std.Error t-Statistic Prob.
C-0.0086850.002294-3.7860060.0002
X0.6166130.0763248.0788830.0000 R-squared0.214509Meandependentvar-0.024413
S.E.ofregression0.018838Akaikeinfocriterion-5.097652 Sumsquaredresid0.084811Schwarzcriterion-5.068732 Loglikelihood616.2670F-statistic65.26835 Durbin-Watsonstat 1.914885Prob(F-statistic)0.000000
(2)明星电力
DependentVariable:Y2
Method:LeastSquares
Date:12/26/11Time:16:46
Sample:1241
Includedobservations:241
Variable Coefficie
nt Std.Error t-Statistic Prob.
C-0.0325260.007661-4.2455950.0000
X-0.2159750.254892-0.8473200.3977
R-squared0.002995Meandependentvar-0.027017 AdjustedR-squared-0.001177S.D.dependentvar0.062873 S.E.ofregression0.062910Akaikeinfocriterion-2.685947 Sumsquaredresid0.945894Schwarzcriterion-2.657027 Loglikelihood325.6566F-statistic0.717951 Durbin-Watsonstat 1.196603Prob(F-statistic)0.397665
(3)三峡水利
DependentVariable:Y3
Method:LeastSquares
Date:12/26/11Time:16:48
Sample:1241
Includedobservations:241
Variable Coefficie
nt Std.Error t-Statistic Prob.
C-0.0293980.004289-6.8536140.0000
X-0.1601040.142712-1.1218690.2630
R-squared0.005238Meandependentvar-0.025314 AdjustedR-squared0.001076S.D.dependentvar0.035242 S.E.ofregression0.035223Akaikeinfocriterion-3.845971
Loglikelihood465.4395F-statistic 1.258591 Durbin-Watsonstat 1.523152Prob(F-statistic)0.263044
(4)九龙电力
DependentVariable:Y4
Method:LeastSquares
Date:12/26/11Time:16:50
Sample:1241
Includedobservations:241
Variable Coefficie
nt Std.Error t-Statistic Prob.
C-0.0237080.004362-5.4346750.0000
X-0.0035840.145136-0.0246930.9803
R-squared0.000003Meandependentvar-0.023616 AdjustedR-squared-0.004182S.D.dependentvar0.035747 S.E.ofregression0.035821Akaikeinfocriterion-3.812283 Sumsquaredresid0.306677Schwarzcriterion-3.783363 Loglikelihood461.3801F-statistic0.000610 Durbin-Watsonstat 1.598474Prob(F-statistic)0.980321
(5)桂东电力
DependentVariable:Y5
Method:LeastSquares
Date:12/26/11Time:16:52
Sample:1241
Includedobservations:241
Variable Coefficie
nt Std.Error t-Statistic Prob.
C-0.0274010.003728-7.3510100.0000
X-0.1745390.124019-1.4073600.1606
R-squared0.008219Meandependentvar-0.022949 AdjustedR-squared0.004069S.D.dependentvar0.030672 S.E.ofregression0.030609Akaikeinfocriterion-4.126758 Sumsquaredresid0.223927Schwarzcriterion-4.097838 Loglikelihood499.2743F-statistic 1.980662