Vectorised SSD PAF lookup for one analyte — .ssd_paf

Returns the proportion of species affected at each concentration in conc. Concentrations that are NA, <= 0, or non-finite map to PAF = 0. When a fitted SSD object is available it is evaluated via a spline lookup (fast path) or a single ssdtools::ssd_hp() call (exact fallback); otherwise it falls back to a per-value ssd_paf() lookup.

Usage

.ssd_paf_vec(fit, conc, analyte, method, guideline_dir)

Arguments

fit: Fitted SSD object (from the fit list-column) or NULL.
conc: Numeric vector of adjusted concentrations.
analyte: Analyte name (fallback ssd_paf() lookup only).
method: SSD method (fallback only).
guideline_dir: Path to ANZG XLSX folder (fallback only).

Value

Numeric vector the same length as conc, PAF as a proportion (0–1).