Saranga, K.A.P., Rusgiyono, A. and Hoyyi, A. 2026. Mean-Variance Portfolio Optimization Based on Ledoit-Wolf Shrinkage With K-Medoids Clustering Approach for The Idxbumn20 Index. International Journal Of Mathematics And Computer Research. 14, 06 (Jun. 2026), 6564-6570. DOI:https://doi.org/10.47191/ijmcr/v14i6.08.