Approximating bottled water consumption (BWC) distribution is complicated by zero observations in the sample. To deal with the zero observations, a mixture model of BWC distributions is considered to allow a point mass at zero. The model is empirically verified for household BWC survey data.

Conventional parametric estimation of the hedonic price models is not robust to heteroscedastic and/or non-normal error structure. This paper applies least absolute deviations (LAD) estimation as a robust approach to estimating the hedonic price models, using the Korea housing markets data. The...

This article investigates empirically the impacts of the internet access charge on economic activity using a cross-country analysis based on data from 76 countries for the year 1998-2001. The results show that the level of the Internet access charge has a significantly negative effect on the...

This paper examines the long-run and short-run causality issues between public R&D expenditure and private R&D expenditure in Korea by using the cointegration and error-correction models. The overall results show that there exists bidirectional causality between public R&D expenditure and...

This paper analyses the determinants of the subscription time for portable Internet service (PIS). To this end, a two-equation model, which incorporates a two-level decision structure: a decision on whether to subscribe for the PIS and a decision on the subscription time conditional on deciding...

This article attempts to estimate household tap water demand function using the data from a survey conducted on households in the Korean metropolitan cities by employing a sample selection model. The results show that there exists sample selection bias in the sample and that failure to correct...

Controlling unsolicited commercial spam mail has become an increasingly critical issue. This study applies a contingent valuation method to measuring the inconvenience cost of spam mail. The mean willingness to pay for controlling the commercial spam mail per individual is estimated as 1836...

This paper explores the impacts of information technology (IT) investment on economic growth using a cross-country analysis based on data from 56 developing countries for the years 1970-1998. The results show that IT investment significantly contributes to economic growth in the developing world.

Conventional parametric approach to dealing with zero expenditures is not robust to heteroscedastic and/or non-normal error structure. This paper applies symmetrically censored least squares estimation as a robust approach to dealing with zero expenditures on mobile communications in Seoul,...

This paper analyses the willingness to pay (WTP) of South Koreans for Korean unification. To deal with zero WTP responses given by a large number of people, a mixture model is used. The mean annual WTP for Korean unification is 5765 Korean won (GBP 2.88) per person. The aggregate value to South...