/**
 * Regression Detector
 *
 * Detects regressions using statistical methods.
 * Supports Z-score, T-test, Mann-Whitney U, and percentile-based detection.
 */
import type { RegressionDetection, RegressionConfig, TimeSeriesPoint, Baseline } from './types.js';
/**
 * Regression Detector class
 */
export declare class RegressionDetector {
    private config;
    private baselines;
    constructor(config?: Partial<RegressionConfig>);
    /**
     * Detect regressions by comparing current values to baseline
     */
    detectRegressions(currentData: Record<string, number>, currentRunId: string, gate: string, context?: Record<string, unknown>): RegressionDetection[];
    /**
     * Detect regression for a single metric
     */
    private detectMetricRegression;
    /**
     * Perform statistical test
     */
    private performStatisticalTest;
    /**
     * Z-score test
     */
    private zScoreTest;
    /**
     * T-test (simplified for single value vs baseline)
     */
    private tTest;
    /**
     * Percentile test
     */
    private percentileTest;
    /**
     * Calculate percentile for a value in baseline
     */
    private calculatePercentile;
    /**
     * Normal CDF (cumulative distribution function)
     */
    private normalCDF;
    /**
     * Student's t CDF approximation
     */
    private studentTCDF;
    /**
     * Check if change constitutes a regression
     */
    private isRegression;
    /**
     * Get direction of change (worse/better/neutral)
     */
    private getDIRECTION;
    /**
     * Calculate regression severity
     */
    private calculateSeverity;
    /**
     * Generate suggestions for regression
     */
    private generateSuggestions;
    /**
     * Update baseline with new data
     */
    updateBaseline(metricName: string, data: TimeSeriesPoint[]): void;
    /**
     * Get baseline for a metric
     */
    getBaseline(metricName: string): Baseline | undefined;
    /**
     * Get all baselines
     */
    getAllBaselines(): Baseline[];
    /**
     * Get threshold for a metric
     */
    private getThresholdForMetric;
    /**
     * Check if metric matches pattern
     */
    private metricMatchesPattern;
    /**
     * Get regression type for metric
     */
    private getTypeForMetric;
    /**
     * Extract component name from metric and context
     */
    private extractComponent;
    /**
     * Check if metric should be ignored
     */
    private shouldIgnore;
    /**
     * Create default configuration
     */
    private createDefaultConfig;
}
/**
 * Create a regression detector
 */
export declare function createRegressionDetector(config?: Partial<RegressionConfig>): RegressionDetector;