If true, the FitState uses per-phenotype information and must be refit for each phenotype.
Initializes a FitState for a (covariate matrix, phenotype array) pair.
Initializes a FitState for a (covariate matrix, phenotype array) pair.
As much memory allocation as possible should be performed in this step to avoid allocations in the per-row fit.
Base trait for logistic regression tests