PINV matrix function
PINV(A) Returns the Moore-Penrose Pseudoinverse matrix of the matrix A.
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.