Author presents both K=2 and K=3 DOLS estimates as equally reliable, no single headline chosen || 'in both cases, the estimators and the t-statistics have almost equal values, and are thereby considered sufficiently reliable' (p.417) and abstract: 'the price effect is negative and elastic' (p.412)
Nakajima, T. (2010): "The residential demand for electricity in Japan: An examination using empirical panel analysis techniques." Journal of Asian Economics, 21(4), 412–420.