Authors' headline own-price elasticity is the Swamy-model average, emphasized in abstract/conclusions as the consistent-and-efficient estimate and the only own-price coefficient significant for electricity || "Own-price elasticity estimates display small negative effects in both demands and significant effects in electricity but insignificant in natural gas" (p.364); Table 1 Swamy average kwhp = -0.132, t=-3.67 (p.360)
Garcia-Cerrutti, L. M. (2000): “Estimating Elasticities of Residential Energy Demand from Panel County Data Using Dynamic Random Variables Models with Heteroskedastic and Correlated Error Terms.” Resource and Energy Economics 22(4), 355-366