주성분분석을 이용한 한국주식시장의 모멘텀 효과 연구

This study devises a new momentum measure (principal component momentum, PMOM) by reflecting the commonality of the traditional momentum measures(cross-sectional momentum, time-series momentum, moving-average momentum). And we use the PMOM to verify the momentum effect in the Korean stock market. Principal component analysis is used to extract commonality. The main results are as follows. First, negative momentum profits in the Korean stock market are strongly observed regardless of the choice of momentum measure. Second, the newly devised PMOM brings a meaningful improvement in the size and significance of the investment performance obtained from the momentum strategy compared to the existing momentum measures. Third, this improvement effect is not significantly affected by the volume turnover (a proxy of investor attention), but it is strong in the stock group with a high turnover. Fourth, the improvement of the PMOM remains strong regardless of the seasonality of stock returns and changes in the portfolio formation period and future holding period. These results mean that the PMOM used in this study can be usefully utilized as a method to combine the properties of various momentum measures used in the momentum studies and expand related studies.