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SurvivalCurve

A survival curve with its confidence bounds, one value per step: what the Breslow-Fleming-Harrington estimator returns.

public sealed record SurvivalCurve(SurvivalStep[] Steps, double[] Survival, double[] Lower, double[] Upper, double ConfidenceLevel)

Parameters — Steps are the curve's steps, ascending in time and starting at zero. Survival, Lower and Upper hold the estimate and its two bounds, one entry per step, Lower the smaller. ConfidenceLevel is the level the bounds were built at.

Example — the four arrays share one index.

using Lodestar.Survival;

SurvivalCurve curve = BreslowFlemingHarrington.Estimate([1, 2, 3], [true, true, true]);

int steps = curve.Steps.Length;                          // => 4
double level = curve.ConfidenceLevel;                    // => 0.95
double lastSurvival = Math.Round(curve.Survival[3], 6);  // => 0.15988

Remarks — the shape of KaplanMeierCurve, the bounds excepted: these are the Nelson-Aalen hazard's interval on the log scale, carried through exp(−·), where Kaplan-Meier's are Greenwood's. A separate type keeps one curve from being passed where the other's variance is assumed, as KaplanMeier.CompareAt assumes Greenwood's.

The four arrays are taken and exposed as they are, not copied: writing to one changes this record and what it equals, and every holder of the same array, a with copy included (#1305).

Applies to — net10.0, netstandard2.0.

See also — BreslowFlemingHarrington.Estimate, SurvivalStep.

Members

member	what it does
SurvivalCurve.Equals	Value equality over the steps and the three curves.
SurvivalCurve.GetHashCode	A hash consistent with it.