计量经济学作业

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1、StatisticalApproachtoEconomicissues.(prof.YunmiKim)M2012425JinPenga)RegressweeksworkedontheindicatorvariablemorekidsusingOLS.Onaverage,dowomenwithmorethantwochildrenworklessthanwomenwithtwochildren?Howmuchless?Yes,Womenwithmorethantwochildrenworklessthanwomenwithtwochildren.

2、Thecoefficientis-5.386996.DependentVariable:WEEKSM1Method:LeastSquaresDate:05/11/12Time:10:34Sample:1254654Includedobservations:254654VariableCoefficientStd.Errort-StatisticProb.  C21.068430.054663385.42450.0000MOREKIDS-5.3869960.088609-60.794920.0000R-squared0.014306    Mea

3、ndependentvar19.01833AdjustedR-squared0.014302    S.D.dependentvar21.86728S.E.ofregression21.71034    Akaikeinfocriterion8.993462Sumsquaredresid1.20E+08    Schwarzcriterion8.993544Loglikelihood-1145109.    Hannan-Quinncriter.8.993486F-statistic3696.022    Durbin-Watsonstat1.

4、926530Prob(F-statistic)0.000000b)ExplainwhytheOLSregressionestimatedin(a)mightbeinappropriateforestimatingthecausaleffectoffertility(morekids)onlaborsupply(weeksworked).ThemainreasonwhytheOLSregressionestimatedin(a)mightbeinappropriateisthatoneoftheassumptionsisviolated.Thei

5、ndependentvariablemorekidsisendogenous,whichmeansindependentvariablehascorrelationwitherrorterms.SothisOLSisbiased.c)Thedatasetcontainsthevariablesamesex,whichisequalto1ifthefirsttwochildrenareofthesamesex(boy-boyorgirl-girl)andequalto0otherwise.Arecoupleswhosefirsttwochildr

6、enareofthesamesexmorelikelytohaveathirdchild?Istheeffectlarge?Isitstatisticallysignificant?Yes,Thecoupleswhosefirsttwochildrenareofthesamesexaremorelikelytohaveathirdchild4Theeffectislargeandstatisticallysignificant.BecausethePvalueismuchsmallerthanthea(0.1%or0.5%),thenullHy

7、pothesisshouldberejected.Sothewecanestimatethatthecoefficientofvariablesamesexisnot0.DependentVariable:MOREKIDSMethod:LeastSquaresDate:05/11/12Time:11:21Sample:1254654Includedobservations:254654VariableCoefficientStd.Errort-StatisticProb.  C0.3464250.001365253.79100.0000SAME

8、SEX0.0675250.00192035.174130.0000R-squared0.004835    Meandependentvar0.380