השוואת שיטות

	אומדני סקלה חסינים Sn ו-Qn	רגרסיית קוונטילים
תחום	סטטיסטיקה	אקונומטריקה
משפחה	Regression model	Regression model
שנת המקור	1993	1978
הוגה השיטה	Rousseeuw & Croux	Koenker & Bassett
סוג	Robust scale estimator	Conditional quantile regression
מקור מכונן	Rousseeuw, P. J., & Croux, C. (1993). Alternatives to the Median Absolute Deviation. Journal of the American Statistical Association, 88(424), 1273-1283.	Koenker, R. & Bassett, G., Jr. (1978). Regression Quantiles. Econometrica, 46(1), 33-50.
כינויים	Sn estimator, Qn estimator, Rousseeuw-Croux scale estimators, robust scale estimation	conditional quantile regression, regression quantiles, Kantil Regresyon
קשורות	5	5
תקציר	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.	Quantile regression models conditional quantiles of an outcome - the median, the 25th or 75th percentile, and so on - rather than the conditional mean that OLS targets. Introduced by Koenker and Bassett in 1978, it reveals how predictors act across the whole distribution, including its tails.