sensitivity_curvature: Dose-Varying Fragility: Curvature-Based Sensitivity

In RobustMediate: Causal Mediation Analysis with Diagnostics and Sensitivity Analysis

Dose-Varying Fragility: Curvature-Based Sensitivity

Description

Computes the fragility curvature of the mediation effect across the full treatment dose grid. Returns local fragility index, numerical curvature of the effect curve, and a fragility zone flag at each dose value.

Usage

sensitivity_curvature(x, estimand = c("NIE", "NDE", "TE"))

Arguments

x	A robmedfit object.
estimand	Which estimand to analyse: "NIE" (default), "NDE", or "TE".

Value

A data frame with columns dose, estimate, lower, upper, se_approx, frag_local, curvature, and in_fragility_zone.

See Also

plot_curvature(), sensitivity_meditcv_profile()

Examples

data(sim_mediation)
  fit <- robustmediate(
    X ~ Z1 + Z2, M ~ X + Z1 + Z2, Y ~ X + M + Z1 + Z2,
    data = sim_mediation, R = 20, verbose = FALSE
  )
curv <- sensitivity_curvature(fit, estimand = "NIE")
plot_curvature(curv)

RobustMediate documentation built on April 16, 2026, 5:08 p.m.