단독주택 매매시장 거래사례의 표본편의 분석

A Study on the Transactions Bias of Detached Housing Market

The data of house transactions have been used as a barometer for housing market when the Government and people make their housing-related decisions for the past decade. Usually the data users have a heavy reliance that the transaction prices can represent the values of the whole housing stock because the transactions are random samples of the house population at that time. However, such reliance is not estimated suitable for the case of detached houses in Korean market, where the owners of high-density buildings can make large profits, and therefore the buyers of the detached houses have shown the growing tendency to reconstruct multi-family houses or other high-density buildings after demolishing the old ones since 2009. In order to prove sample bias in Korean detached house transactions, this paper collects housing market transaction data(2006~2014), declared house price data(2006~2016) and registered building data for 25 districts(Gu) in Seoul and investigates them by means of statistical processing. Finally it shows that the land characteristics of transactions are heterogeneous compared to the population characteristics and the price also has a tendency of upward bias. The upward bias is proven to be closely related to the land characteristics which are favorable to the reconstruction of high-density buildings through Hedonic Price Model.