import { result } from "../../utility/result.js";
import { DistError } from "../DistError.js";
import { PointSetDist } from "../PointSetDist.js";
import { BaseSymbolicDist } from "./BaseSymbolicDist.js";
export declare class Poisson extends BaseSymbolicDist<"Poisson", number> {
    lambda: number;
    readonly symbolicType = "Poisson";
    constructor(lambda: number);
    toString(): string;
    static make(lambda: number): result<Poisson, string>;
    getArgs(): number;
    simplePdf(x: number): number;
    cdf(k: number): number;
    inv(p: number): number;
    mean(): number;
    variance(): result<number, DistError>;
    sample(): number;
    _isEqual(other: Poisson): boolean;
    toPointSetDist(): result<PointSetDist, DistError>;
}
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