Abstract and conclusions headline the bivariate-model price elasticity 0.2463 as THE result; the univariate estimate is presented only as the misspecified comparison rejected by the selection-bias tests || 'based on the bivariate model, the price and income elasticities were estimated to be 0.2463 and 0.0593... The model assuming no sample selection bias, therefore, is misspecified.' (Abstract p.5702; pp.5703, 5706)
Yoo, S.-H., J. S. Lee, and S.-J. Kwak (2007): “Estimation of Residential Electricity Demand Function in Seoul by Correction for Sample Selection Bias.” Energy Policy 35(11), 5702-5707