השוואת שיטות

	אומדן סטיית תקן מוחלטת חציונית (MAD)	אומדני סקלה חסינים Sn ו-Qn
תחום	סטטיסטיקה	סטטיסטיקה
משפחה	Regression model	Regression model
שנת המקור	1974	1993
הוגה השיטה	Hampel (influence-curve treatment); classical robust statistics	Rousseeuw & Croux
סוג	Robust scale estimator	Robust scale estimator
מקור מכונן	Hampel, F. R. (1974). The Influence Curve and Its Role in Robust Estimation. Journal of the American Statistical Association, 69(346), 383-393.	Rousseeuw, P. J., & Croux, C. (1993). Alternatives to the Median Absolute Deviation. Journal of the American Statistical Association, 88(424), 1273-1283.
כינויים	median absolute deviation, MAD scale estimator, robust scale estimation, Medyan Mutlak Sapma (MAD) Tahmini	Sn estimator, Qn estimator, Rousseeuw-Croux scale estimators, robust scale estimation
קשורות	5	5
תקציר	Median Absolute Deviation estimation is a robust measure of statistical dispersion that replaces the standard deviation when outliers are present. Rooted in the influence-curve framework formalised by Hampel (1974), it summarises the spread of a continuous variable using medians instead of means, so a single extreme value cannot distort the result.	Sn and Qn are robust estimators of scale (spread) proposed by Rousseeuw and Croux (1993) as alternatives to the median absolute deviation (MAD). Both attain a 50% breakdown point while delivering higher statistical efficiency than MAD, so they measure dispersion accurately even when the data contain outliers.