Audit the Fixed-Effects Design Matrix — audit_fixed_effect

Checks rank, singular values, condition number, invariant columns and extreme leverage before fitting Stan. The audit never rewrites a formula or drops a predictor automatically.

Usage

audit_fixed_effect_design(
  x,
  contract = NULL,
  condition_number_review = 30,
  condition_number_fail = 100,
  leverage_multiplier = 3
)

Arguments

x: A data frame, prepared object, model specification, or fit.
contract: Required when x is a raw data frame.
condition_number_review: Condition number triggering review.
condition_number_fail: Condition number triggering fail.
leverage_multiplier: Review observations whose hat value is above leverage_multiplier * p / n.

Value

A gp3bayes_fixed_effect_design_audit.