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The Efficient Estimation with and/or without Heteroskedasticity using either OLS or WLS
정건섭 한국비교정부학회 2010 한국비교정부학보 Vol.14 No.2
As far as the heteroskedasticity is concerned, it will cause the estimated variance of the coefficient to influence both direction, upward and downward. In other words, the estimated of variance of the coefficient can be overestimated or estimated depends on the nature of causing factors in the model. If we persist in using the usual testing procedures despite heteroskedasticity, whatever conclusions we draw or inferences we make be very misleading. As a result, we can no longer rely on the conventionally computed confidence intervals and the conventionally employed t and F tests. The effect of heteroskedasticity on the test for homogeneity across samples has concentrated on the case of heteroskedasticity between samples but not within samples in the previous research. The most important conclusions of this paper in terms of methodological point of view can be summarized as follows: (i) Hedonic models of housing prices must be corrected for heteroskedasticity to ensure greater efficiency in the estimation of hedonic prices wherever the heteroskedasticity does exist; and (ii) After careful detection of heteroskedasticity, a combination OLS(Ordinary Least Squares) with WLS(Weighted Least Squares) estimates provides the greatest predictive power with respect to estimate of housing prices in the study area. In other words, if there has no evidence of heteroskedasticity, the OLS should be utilized; otherwise, the WLS must be utilized.
공유경제 실현을 위한 카쉐어링 이용성과 요인 분석에 대한 연구
정건섭,조경복,김성우 한국비교정부학회 2015 한국비교정부학보 Vol.19 No.3
The study is concerned with Availability and Factor Analysis on Car-Sharing for Sharing Economy with the view of local economy and governance. Accordingly, the relevant theory and references are reviewed, and the survey is performed. The founding of the study can be summarized as follows. According to the survey, it is revealed the more willingness to use car-sharing, as the higher frequency of public transportation availability. Therefore, the policy alternatives should be prepared in near future in order to improve the relation or connection between public transportation and car-sharing; for example, the preparedness of transit system of KTX or bus terminal, etc. Also, the boom of car-sharing industry should be foster based on the reduction of social cost, the increase of confidence, and the realization of social value; which, in turn will be contributed to the construction of collaborative local governance and regional economic development. In this vein, when it comes to urban planning or regeneration, it is desirable to consider the car-sharing from the start phase as small town of city. Lastly, in order for sharing economy to help to realize desirable social values and for car-sharing service to get introduced and developed in local economy, it is necessary to found a car-sharing policy roundtable which should have practical authority and responsibility to play its role in realizing the values of local sharing economy, including social-problem solving, and local economy promotion
지방대학생의 국가자격증 취득 실태와 과제 -부산지역 대학생을 중심으로-
정건섭 한국비교정부학회 2009 한국비교정부학보 Vol.13 No.2
This study is trying to find out the remedy for job market to the young students, considering difficult times in recent years. In order to do so, the acquisition of the national certificates of qualification and tasks are investigated. Specifically, the status of national certification is examined. The relation between certificates of qualification and job market is investigated, too. By way of the survey with the university and college students in the Busan, We are trying to find out the problems with the certificates of qualification; and we are trying to figure out how to deal with the problems to increase the connectivity of actual decent jobs. Based on the survey and the various statistic sources, we draw on the several policy alternatives in order to proper match between certificates of qualification and decent job market to the university and college students.