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Panel DataFinite Sample PropertiesOrdinary Least SquaresQuantile RegressionTreatment EffectsUnobserved HeterogeneityTest StatisticUndergraduate EconometricsLinear ModelsRegression DiscontinuityEstimatorAverage Treatment EffectInstrumental Variables EstimationMaximum LikelihoodLinear RegressionInstrumental VariableExplanatory VariablesVariance-covariance MatrixData ModelsTreatment Effect