Before revision:  By investigating the significant contributors of the large eigenvectors in different rolling windows, we observe a dynamic evolution behavior in business sectors such as IT, electronics, and real estate, which are those industries leading the rise (drop) before (after) the crash .
After revision:  By investigating the significant contributors of the large eigenvectors in different rolling windows, we observe a dynamic evolution behavior in business sectors such as IT, electronics, and real estate, which lead the rise (drop) before (after) the crash .