ANALISIS PENGARUH PERUBAHAN KOMPOSISI LQ 45 TERHADAP RETURN SAHAM

An index in a stock market represents the performance of the stock market itself. An addition of a stock to an index can increase investor�s confidence toward the stock, and deletion of a stock from an index can decrease investor�s confidence toward the stock. This research uses abnormal return as a proxy to measure investor�s confidence. Steps in calculating the abnormal return is by substracting the daily return with the expected return. The statistic test used by this research is one sample ttest. The result of this research shows that there is a positive and significant abnormal return for additio