import { TrendIndicator } from '../../base/Indicator.js';
import type { LinearRegressionResult } from '../../util/math/getLinearRegression.js';
export declare class LinearRegression extends TrendIndicator<LinearRegressionResult, number> {
    readonly inputShape: "price";
    readonly prices: number[];
    readonly interval: number;
    constructor(interval: number);
    getRequiredInputs(): number;
    update(price: number, replace: boolean): LinearRegressionResult | null;
    protected calculateSignalState(result?: LinearRegressionResult | null): "BEARISH" | "BULLISH" | "SIDEWAYS" | "UNKNOWN";
    get isStable(): boolean;
}