Computes the inverse of the cross-product of a matrix X.
a matrix, typically a regressor matrix.
a string indicating whether the QR decomposition,
the Cholesky decomposition or
Using the Cholesky decomposition of X'X (as computed by
is computationally faster and preferred to
solve(crossprod(X)). Using the
QR decomposition of X is slower but should be more accurate.
a matrix containing the inverse of
1 2 3
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