The purpose of this research was to examine the existence of Monday Effect, Week Four Effect, and Rogalsky Effect on stock return of LQ-45 index ini Indonesian Stock Exchange (IDX) during 2019 – 2020. The statistic methods used to test the hypotheses are Mann Whitney. The results show that Monday Effect, Week Four Effect, and Rogalsky Effect exist on stock return of LQ-45 index in IDX.Keywords :Monday Effect, Week Four Effect, Rogalsky Effect, Return
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