CSSQ matrix function
CSSQ(A) returns a row vector with the same number of columns as the argument. Each column of the result contains the sum of the squared values of the elements in the corresponding column of the argument.
Matrix Algebra Useful for Statistics
Shayle R. Searle, Andre I. Khuri
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This book addresses matrix algebra that is useful in the statistical analysis of data as well as within statistics as a whole. The material is presented in an explanatory style rather than a formal theorem-proof format and is self-contained.