IE-Lecture7-Mulitiple regression.ppt
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IE-Lecture7-Mulitiple regression.ppt

IE-Lecture7-Mulitipleregression.ppt

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OLSEstimatorsinMultipleRegressionOLSEstimatorsinMultipleRegressionAoneunitchangeinX3leadstoab3unitchangeinY,holdingX2constant.AoneunitchangeinX2leadstoab2unitchangeinY,holdingX3constant.PredictedvalueofY(Y)inunitsofYwhenX2andX3aresimultaneouslyzero.Example:EarningsRegressionEstimationusingMicrofitInterpretationBivariateregressionAsinsimpleregression,itisdesirablefornandVar(X2)tobelargeandtobesmallButinmultipleregression,alsodesirableforcorrelationbetweenX2andX3tobelow.Doesexperiencehaveaneffectonearnings?AdjustedR2()OverallfitofregressionDeriveandinterprettheelasticityofearningswithrespecttoschoolingfortheaboveregression.