Matrices are the big rectangles full of numbers that often crop up in statistical analysis techniques, and doing calculations with them doesn't work quite the same as with normal numbers In mathematics, a matrix (plural matrices) is a rectangular array (see irregular matrix) of numbers, symbols, or expressions, arranged in rows and columns
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Math·Multivariable calculus·Applications of multivariable derivatives·Quadratic approximations. The Hessian is a matrix which organizes all the second partial derivatives of a function How to use matrix methods to generate a variance-covariance matrix from a matrix of raw data. Includes sample problem with solution