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You have found data that indicates that the income elasticity of demand for generic (unbranded) shampoo is −0.7. You should conclude that generic shampoo

Partial Least Squares (PLS) differs from PCA because PLS:

In a population GLM, “coupling filters” are used to capture:

If is ill-conditioned, using the pseudoinverse (SVD-based) is a standard remedy.

A GLM can attribute variability in spiking to:

The normal equations come from setting which quantity to zero?

In a Poisson model, mean and variance are both equal to

In logistic regression, the typical optimization objective for binary labels is:

For severe class imbalance, which evaluation choice is most defensible?

The least-squares orthogonality principle states that at the optimum: