평가기반 아파트가격지수에서의 비대칭 평활화 현상에 관한 연구
Asymmetrical Smoothing in the Appraisal Based Apartment Price Index
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We investigate the smoothing phenomenon in the Kookmin Bank apartment price index, the most widely used appraisal based apartment price index in Korea using a repeat sales index based on the transaction data published by the Ministry of Land, Transport and Maritime Affairs. In summary, we find that there is a greater degree of smoothing in the appraisal based apartment price index during the up market than the down market, that is, the appraisal based apartment price index tracks the sales price based index relatively slowly during the down market while it tracks the sales price based index relatively fast during the up market. The volatility in the sales price based index is far greater than the volatility in the appraisal based price index during the down market, but not during the up market. Only about one quarter of the new sale prices are priced in the appraisal during the down market while the new sale prices account for almost half of the appraisal based apartment price index during the up market. We also show that during the down market the appraisal based apartment price index reduces the gap from the sales price based index in subsequent periods only limitedly so that the smoothing during the down market tends to be persistent. We find that the transaction volume, which is a measure of information in sale prices, has a negative influence on the gap between the appraisal based apartment price index and the sales price based index. However, even when we control for the volume effect, the down market effect is still present suggesting that the asymmetrical smoothing between the down market and the up market is caused not only by the information effect of volume but also by other factors present in the down market. Our findings are generally consistent with the asymmetrical smoothing hypothesis where the smoothing in the appraisal based apartment price index is greater during the down market than during the up market.
Abstract
We investigate the smoothing phenomenon in the Kookmin Bank apartment price index, the most widely used appraisal based apartment price index in Korea using a repeat sales index based on the transaction data published by the Ministry of Land, Transport and Maritime Affairs. In summary, we find that there is a greater degree of smoothing in the appraisal based apartment price index during the up market than the down market, that is, the appraisal based apartment price index tracks the sales price based index relatively slowly during the down market while it tracks the sales price based index relatively fast during the up market. The volatility in the sales price based index is far greater than the volatility in the appraisal based price index during the down market, but not during the up market. Only about one quarter of the new sale prices are priced in the appraisal during the down market while the new sale prices account for almost half of the appraisal based apartment price index during the up market. We also show that during the down market the appraisal based apartment price index reduces the gap from the sales price based index in subsequent periods only limitedly so that the smoothing during the down market tends to be persistent. We find that the transaction volume, which is a measure of information in sale prices, has a negative influence on the gap between the appraisal based apartment price index and the sales price based index. However, even when we control for the volume effect, the down market effect is still present suggesting that the asymmetrical smoothing between the down market and the up market is caused not only by the information effect of volume but also by other factors present in the down market. Our findings are generally consistent with the asymmetrical smoothing hypothesis where the smoothing in the appraisal based apartment price index is greater during the down market than during the up market.
참고문헌 (19)
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