pub fn normal_logsf(x: f64) -> f64Expand description
Numerically stable ln(1 − Φ(x)) = ln Φ(−x) for the standard normal survival
function. Implementation lives in gam-math; re-exported to keep
crate::probability::normal_logsf resolving for all existing callers.
Numerically stable ln(1 − Φ(x)) = ln Φ(−x) for the standard normal
survival function. Delegates to normal_logcdf(-x) so the deep-right
tail benefits from the same erfcx-based representation.