Check if rows and columns of matrices have more than one non-zero element? For vector x, xx0 = N ×N matrix with ijth element x ix j A square matrix is symmetric if it can be ﬂipped around its main diagonal, that is, x ij = x ji. Gherase, D.E.B. We shall elaborate in the chapters that follow. Suppose X is an n x k matrix holding ordered sets of raw data. Or better, they are, but only if I take a number of identical samples from the same population. This is included in Practical Regression and Anova using R Dear all, I have a dataset containing roughly 200 companies with daily stock data for 10 years.
2020 variance covariance matrix of error term