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Elly Susanti, Nelly Ervina, Ernest Grace and Liper Siregar 2021. Comparison Analysis Of Optimal Portfolio Formation Results Using Single Index Model With Markowitz Model During The Covid 19 Pandemic In LQ 45 Index Company. International Journal of Educational Research & Social Sciences . 2, 5 (Nov. 2021), 1146–1156. DOI:https://doi.org/10.51601/ijersc.v2i5.177.