Comparar métodos

	Modelo ARMA Robusto	OLS Robusto (OLS com Erros Padrão Robustos)
Área	Econometria	Econometria
Família	Regression model	Regression model
Ano de origem	1986	1980
Autor original	Martin & Yohai (1986); broader robust time series literature	Halbert White
Tipo	Robust time series model	Linear regression with robust inference
Fonte seminal	Franses, P. H., & Ghijsels, H. (1999). Additive outliers, GARCH and forecasting volatility. International Journal of Forecasting, 15(1), 1-9.	White, H. (1980). A heteroskedasticity-consistent covariance matrix estimator and a direct test for heteroskedasticity. Econometrica, 48(4), 817–838.
Outros nomes	robust ARMA, outlier-robust ARMA, M-estimator ARMA, resistant ARMA estimation	HC robust regression, White robust OLS, sandwich estimator OLS, OLS with robust standard errors
Relacionados	5	6
Resumo	The Robust ARMA model extends the classical Autoregressive Moving Average framework by replacing the sensitive least-squares loss with outlier-resistant estimation methods — typically M-estimators or median-based approaches. This protects coefficient estimates and forecasts from being distorted by additive outliers, level shifts, or innovational outliers that are common in economic and financial time series.	Robust OLS applies ordinary least squares to estimate coefficients and then replaces the classical standard errors with heteroscedasticity-consistent (HC) standard errors — commonly called White standard errors. This leaves the point estimates unchanged while yielding valid t-statistics and confidence intervals even when the error variance is not constant across observations.