import { FundamentalStatistics } from '../types/index.js';
/**
 * 采样数据
 */
export declare function sampleData(data: Array<Record<string, any>>, period: 'daily' | 'weekly' | 'monthly', metricsList: string[]): Array<Record<string, any>>;
/**
 * 计算统计指标
 */
export declare function calculateStatistics(data: Array<Record<string, any>>, metric: string): FundamentalStatistics;
/**
 * 生成时间范围字符串
 */
export declare function generateTimeRange(data: Array<Record<string, any>>): string;