Check RTMB optimizer diagnostics for a fitted nowcast

Predictive accuracy belongs to tbl.now::score_nowcast() and tbl.now::nowcast_backtest(). fit_check() deliberately reports only diagnostics specific to the RTMB optimization performed by diseasenowcasting.

Usage

fit_check(object, warn = TRUE)

Arguments

object

A result from nowcast() or auto_nowcast(). Native diseasenowcasting operations unwrap the common result automatically.

warn

If TRUE, warn when any retained fit fails the common optimizer adequacy predicate: finite objective and derivatives, optimizer code zero, box-constrained KKT residual, positive-definite curvature on the locally free subspace, and a quadratic objective-gap estimate no larger than 0.01.

Value

A data frame with one row per retained RTMB fit and columns fit, rung, convergence, objective, raw and projected gradients, quadratic objective gap, Hessian status, any Laplace-precision regularization used for prediction, overall status, and diagnostic reasons.

See also

diseasenowcasting_workflows for the distinction between native fit diagnostics and predictive scoring; nowcast_diagnostic(), tbl.now::score_nowcast(), tbl.now::nowcast_backtest()