import { Params } from '../base/estimator';
import { EmpiricalCovariance, EmpiricalCovarianceProps } from './empiricalCovariance';
export interface ShrunkCovarianceProps extends EmpiricalCovarianceProps {
    shrinkage?: number;
}
export declare class ShrunkCovariance extends EmpiricalCovariance {
    protected shrinkage: number;
    constructor(props?: ShrunkCovarianceProps);
    getParams(): Params;
    fit(X: number[][]): void;
    get shrinkageValue(): number;
}
export declare class LedoitWolf extends EmpiricalCovariance {
    private shrinkageState;
    getParams(): Params;
    fit(X: number[][]): void;
    get shrinkageValue(): number;
}
export declare class OAS extends EmpiricalCovariance {
    private shrinkageState;
    getParams(): Params;
    fit(X: number[][]): void;
    get shrinkageValue(): number;
}