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	Kvantil-i-kvantil-regression (QQ-regression)	Kvantilregression
Ämnesområde	Ekonometri	Ekonometri
Familj	Regression model	Regression model
Ursprungsår	2015	1978
Upphovsperson	Sim and Zhou	Koenker & Bassett
Typ	Nonparametric quantile regression	Conditional quantile regression
Ursprungskälla	Sim, N., & Zhou, H. (2015). Oil prices, US stock return, and the dependence between their quantiles. Journal of Banking and Finance, 55, 1-8.	Koenker, R. & Bassett, G., Jr. (1978). Regression Quantiles. Econometrica, 46(1), 33-50.
Alias	QQ regression, QQ approach, quantile-on-quantile approach, nonparametric quantile regression	conditional quantile regression, regression quantiles, Kantil Regresyon
Närliggande	6	5
Sammanfattning	Quantile-on-quantile regression is a nonparametric technique that estimates how the quantiles of one variable depend on the quantiles of another. By combining standard quantile regression with local linear smoothing, it produces a full two-dimensional surface of slope coefficients indexed by both the quantile of the outcome and the quantile of the predictor, revealing heterogeneous and asymmetric dependency structures invisible to standard regression.	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.