Rusdah Rusdah
Department of Computer Science, Universitas Budi Luhur, Indonesia

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Regime-Sensitive VaR Forecasting for Indonesian Gold with Quantile LSTM: Walk-Forward Backtesting and Stress Diagnostics Antika Zahrotul Kamalia; Arief Wibowo; Rusdah Rusdah
Jurnal Teknik Informatika (Jutif) Vol. 7 No. 5 (2026): JUTIF Volume 7, Number 5, October 2026
Publisher : Informatika, Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52436/1.jutif.2026.7.5.5740

Abstract

This study investigates regime-sensitive Value-at-Risk (VaR) forecasting for ANTAM Indonesian gold using a Quantile LSTM under a rigorous walk-forward evaluation protocol. Daily prices are transformed into log-returns, and volatility- and momentum-based features are constructed in a time-respecting manner to prevent information leakage. The model is trained with multi-quantile pinball loss to estimate one-day-ahead VaR at and . Out-of-sample performance is evaluated using a walk-forward expanding-window scheme with periodic retraining, and stress-regime diagnostics are conducted via rolling-volatility-based regime labeling to assess stability during turbulent episodes. Quantile LSTM is benchmarked against standard VaR baselines (Historical Simulation, parametric normal, EWMA, and GARCH(1,1) with normal and Student-t innovations) using violation rates, Kupiec and Christoffersen backtests, pinball loss, and loss-based model comparison. Results indicate good aggregate calibration for Quantile LSTM, with violation rates of 0.554% (6/1083) for VaR 1% and 5.079% (55/1083) for VaR 5%, passing unconditional coverage. However, at  there are indications of clustered exceedances, highlighting the value of rolling and regime-based diagnostics. At the 1% tail, GARCH-t achieves lower and significantly different pinball losses, reinforcing heavy-tail models as strong benchmarks for extreme risk. Beyond accuracy metrics, the regime-sensitive diagnostics provide actionable signals for deploying Quantile LSTM within automated risk-monitoring pipelines, where rolling exceedance alarms and adaptive retraining can improve operational reliability under volatility regime shifts.