2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/212353An adaptive nonparametric estimation procedure is constructed for the estimation problem of heteroscedastic regression when the noise variance depends on the unknown regression. A non-asymptotic upper bound for a quadratic risk (an oracle inequality) is constructed.Statistics Theory62G08, 62G05, 62G20Adaptive nonparametric estimation in heteroscedastic regression models. Part 1: Sharp non-asymptotic Oracle inequalitiestext