/**
* Error function (erf) approximation
* Based on Abramowitz and Stegun formula 7.1.26
*/
export declare function erf(x: number): number;
/**
* Standard normal CDF (cumulative distribution function)
*/
export declare function normalCDF(x: number): number;
/**
* Inverse error function approximation
*/
export declare function erfInv(x: number): number;
/**
* Inverse standard normal CDF (quantile function)
*/
export declare function normalQuantile(p: number): number;
/**
* Power calculation for two-sample t-test
*/
export declare function calculatePower(n: number, effectSize: number, alpha?: number): number;
/**
* Sample size calculation for two-sample t-test
*/
export declare function calculateSampleSize(effectSize: number, alpha?: number, power?: number): number;
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