温馨提示:
1. 部分包含数学公式或PPT动画的文件,查看预览时可能会显示错乱或异常,文件下载后无此问题,请放心下载。
2. 本文档由用户上传,版权归属用户,汇文网负责整理代发布。如果您对本文档版权有争议请及时联系客服。
3. 下载前请仔细阅读文档内容,确认文档内容符合您的需求后进行下载,若出现内容与标题不符可向本站投诉处理。
4. 下载文档时可能由于网络波动等原因无法下载或下载错误,付费完成后未能成功下载的用户请联系客服处理。
网站客服:3074922707
2023
计量
经济学
报告
计量经济学报告
固定资产投资的计量经济学模型
一、解释模型
固定资产对一个企业来说是其主要的劳动手段,它的价值是逐渐地转移到所生产的产品上去.企业同时又是重要的市场主体,因此对固定资产的投资间接得影响到了一个经济体的产出.这里主要对gdp及国有经济固定资产投资额(x1),集体经济固定资产投资额(x2),个体经济固定资产投资额(x3),进行计量经济学多元线性回归模型分析.
原始数据如下:单位(亿元)
obsgdpx1x2
19804517.8745.946
19814860.3667.5115.2
19825301.8845.3174.3
19835957.4952156.3
19847206.71185.2238.7
19858989.11680.5327.5
19862023201.4220239.4391.8
198711954.42448.8547
198814922.3302202311.7
198916917.8282023.2570
199018598.42986.3529.5
199121662.53713.8697.8
199226651.95498.71359.4
199334560.57925.92317.3
1994466720236152758.9
199557494.91202398.23289.4
199666850.512023.23651.5
199773142.71320231.73850.9
199876967.215369.34192.
2由以上数据得到如下ls估计结果,
dependentvariable:gdp
method:leastsquares
date:12/30/2023time:2023:52
sample:19801998
includedobservations:19variablecoefficientstd.errort-statisticprob.
c632.0385787.85220.8022300.4349
x2023.420234461.202383520.3718720.7152
x26.9935122.9834202.3441260.0333
x311.194781.8313866.1127360.0000r-squared0.996478meandependentvar27022.51x3119178.322023.8321.842023535.2649.4759.9202322.1202332.2202301.21182.912221476.21970.62560.23211.23429.43744.4
adjustedr-squareds.e.ofregressionsumsquaredresidloglikelihooddurbin-watsonstat
0.995774s.d.dependentvar1612.032akaikeinfocriterion38979701schwarzcriterion-165.0339f-statistic1.219467prob(f-statistic)
24797.6217.7930417.991871414.7900.000000
显然x1的t检验为非显著性检验,故将x1与x2合并为一个解释变量。也就是将国有经济与集体经济固定资产投资额的和看作为公有经济固定资产投资额(x1+x2).令x1+x2=x1'得到如下检验结果:
dependentvariable:gdpmethod:leastsquaresdate:12/30/2023time:2023:53sample:19801998includedobservations:19
variablecx1+x2x3
r-squaredadjustedr-squareds.e.ofregressionsumsquaredresidloglikelihooddurbin-watsonstat
coefficient-200.2023932.133202392023.14031
std.error633.13990.3291901.802497
t-statistic-0.3160116.479820235.625704
prob.0.7562023.00000.000027022.5124797.6217.8523718.001491918.9160.000000
0.995848meandependentvar0.995329s.d.dependentvar1694.728akaikeinfocriterion45953627schwarzcriterion-166.5975f-statistic1.13802023prob(f-statistic)
,从而得到多元线性回归方程:gdp=-200.202393+2.13320239﹡x1'+2023.14031﹡x3
二、模型检验1.统计学检验
t-statistic检验,显著水平0.05,其临界值为tα/2=2.11,显然6.472744及5.625704远远大于它,其解释变量的prob均为0.0000,即从统计学检验的角度上讲解释变量的选取是有意义的.
f-statistic检验及拟合优度r-squared检验,r-squared值越接近于1,那么f值越大,这里的r-squared值为0.995329,大于0.9拟合优度比较高,因此f—statistic检验亦通过.2.计量经济学检验
a.异方差性检验:
whiteheteroskedasticitytest:f-statisticobsxr-squared
testequation:
dependentvariable:resid^2method:leastsquaresdate:12/30/2023time:2023:55sample:19801998includedobservations:19
variablecx1+x2(x1+x2)^2(x1+x2)xx3
x3x3^2
r-squaredadjustedr-squareds.e.ofregressionsumsquaredresidloglikelihooddurbin-watsonstat
coefficient247520237.-505.6392023.444067-4.429261-289.824412.02527
std.error1758485.1727.662023.556920235.849492023934.68616.41130
0.553341probability3.33420236probability
t-statistic1.42023517-0.2926730.797376-0.757205-0.0324380.732744
0.7336340.648629
prob.0.18270.77440.43960.46240.97460.47672418612.2725196.32.8585433.156780.553342023.73363
40.175478meandependentvar-0.141646s.d.dependentvar2911813.akaikeinfocriterion1.2023e+14schwarzcriterion-306.1561f-statistic1.938280prob(f-statistic)
由表中数据可知没有哪个参数的t检验是显著的,且可决系数的值也比较小。nr^2=3.33462023
第6页 共6页