Najarzadeh, Dariush; Khazaei, Mojtaba; Ganjali, Mojtaba - In: METRON 73 (2015) 1, pp. 57-72
Scatter plots for two multivariate normal data sets may suggest that the constant-density ellipsoid contours of underlying density functions have the same directions. In other words, covariance matrices of the two populations have the same eigenvectors matrix in their spectral decomposition...