Mean Variance Portfolio Selection Utilizing Services Subsector's (Media, Telecommunications, and Information Technology) 30-Year Philippine Stock Exchange Trading Data. - E. D. Salazar; Michael Nayat Young; T. N. Chuahay; Y. Pratseyo; Satria Fadil Persada; R. Nadilfatin; Myra F. Contreras (IEEM, 2024)