A network topology approach to diagnose the shift of covariance structure Nur Syahidah Yusoff, Noryanti Mohamad, Chuan Zun Liang, Shamshuritawati Sharif and Tan Lit Ken MATEC Web Conf., 189 (2018) 03027 Published online: 10 August 2018 DOI: 10.1051/matecconf/201818903027