Chunk #21 — 2 Algorithms for the Lasso, Ridge Regression and the Elastic Net — 2.4 Weighted Updates

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Regularization Paths for Generalized Linear Models via Coordinate Descent.

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If the xj are not standardized, there is a similar sum-of-squares term in the denominator (even without weights). The presence of weights does not change the computational costs of either algorithm much, as long as the weights remain fixed.