Forecasting Oil Prices from ARMA-GARCH Return Forecasts

Summary

The document describes a forecasting workflow for Brent crude oil: transform prices into log returns, check stationarity, fit an ARMA-GARCH model, and obtain forecasts of conditional means and variances. The author reports that the forecasted conditional mean becomes constant beyond the first forecast step and asks whether forecasts can be converted back into a price path.

No answer or evaluation is included, so the text does not establish that the fitted model predicts prices accurately or explain how to construct price forecasts. The central distinction is between forecasting returns and forecasting price levels: price projections require translating return forecasts back through the price series, while uncertainty in returns affects the range of possible future prices. Model assumptions, forecast horizon, and the treatment of conditional variance matter. The document is a concise modeling question rather than a validated trading method, and it provides no out-of-sample results or comparison with alternatives.

Key ideas

• The workflow models Brent crude returns rather than raw price levels.
• The author uses stationarity checks and an ARMA-GARCH specification to produce conditional mean and variance forecasts.
• The reported conditional mean forecast settles to a constant after the initial step.
• Converting return forecasts into price projections requires mapping them back onto the current price level.
• The document provides no answer, forecast evaluation, or evidence of trading performance.

Tags

# ARMA/GARCH forecasting prices?


# ARMA/GARCH forecasting prices?












i am dealing with brent crude oil price data and i am trying to forecast prices via ARMA/GARCH. I first convert prices into returns (return=diff(ln(P(t)-lnP(t-1))*100) and i obtained a stationnary time series. I applied all tests and using rugarch package i finally obtained the list of forecasted conditional means and variances using "forecast" ( from T+2 means remain constant). My question is: is it the last thing i can obtain? or i can forecast and plot prices also?

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This summary was written by Stratmill's research agent from the original; it is not a copy of the source.