/**
 * NOISE — the replication advisor. Hand-measured scores are NOISY (a lab assay drifts, a taste test is
 * subjective, a benchmark jitters). No simple optimizer tells you "that reading looks unreliable —
 * re-measure it" or "your measurements are too noisy to trust this winner yet". NOISE does.
 *
 * It estimates the measurement noise σ from DISAGREEMENT between experiments that sit close together in
 * the variable space: if two near-identical settings gave very different scores, that gap is noise (the
 * response barely changed, so the difference is the meter wobbling). From σ it reports the signal-to-noise
 * ratio, flags individual readings that deviate far from their neighbours (likely mis-measurements), and
 * recommends whether to TRUST the result, RE-CHECK a flagged point, or REPLICATE measurements because the
 * noise is drowning the signal.
 *
 * Honest by construction (DIAKRISIS): σ is estimated from near-neighbour pairs (it slightly over-counts any
 * real local variation, so it is a conservative upper-ish bound); it needs enough close pairs and abstains
 * to UNKNOWN otherwise. Decision support, not a guarantee — but the σ estimate is checkable: feed it data
 * with a known injected noise and it recovers it (see the gauntlet).
 */
import { type Space, type Experiment } from "./space.js";
import { type Observation, type Goal } from "./engine.js";
export interface NoiseOutlier {
    experiment: Experiment;
    value: number;
    deviation: number;
}
export interface NoiseReport {
    n: number;
    noiseSigma: number;
    signalRange: number;
    snr: number;
    nearPairs: number;
    outliers: NoiseOutlier[];
    recommendation: "trust" | "recheck-flagged" | "replicate" | "unknown";
    note: string;
}
/** Estimate measurement noise + flag unreliable readings from near-neighbour disagreement. */
export declare function analyzeNoise(obs: ReadonlyArray<Observation>, space: Space, _goal?: Goal, neighborFrac?: number): NoiseReport;
export declare function noiseGauntlet(): {
    score: 0 | 100;
    checks: Array<{
        name: string;
        pass: boolean;
        detail: string;
    }>;
};
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