export declare function regressionLowess(data: any[], x?: (d: any) => number, y?: (d: any) => number, options?: {
    span?: number;
    degree?: 1 | 0;
    iterations?: number;
    alpha?: number;
    maxSamples?: number;
}): {
    predict: (x0: number | number[]) => number | number[];
    evaluate: any;
    evaluateGrid: (N: number) => {
        x: number;
        y: number;
    }[];
    confidenceInterval: (N?: number) => {
        x: number;
        mean: number;
        lower: number;
        upper: number;
        predLower: number;
        predUpper: number;
    }[];
};
export default regressionLowess;