V-Lab
Vietnam Hanoi Stock Exchange Equity Index GJR-GARCH Volatility Analysis
High-persistence model: shocks decay very slowly, so the theoretical long-run value may not be practically meaningful
Volatility prediction for Friday, July 24th, 2026
1 Day
33.16%
1 Week
33.54%
1 Month
35.04%
Analysis last updated: Friday, July 24, 2026 at 11:20 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jul 13, 2005 to Apr 29, 2026Model Insight
Estimated persistence of 1.000 is at or above 1 (non-stationary): volatility shocks do not decay and the long-run variance is undefined, so long-horizon forecasts should be treated with caution.
Leverage: Negative returns increase volatility 58% more than positive returns
GJR-GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0507 | 24.93*** |
α ARCH Response to squared shocks | 0.1471 | 24.36*** |
β GARCH Volatility persistence | 0.8100 | 210.72*** |
γ leverage Additional response to negative shocks | 0.0857 | 9.20*** |
Persistence:
1.000
Half-life:
-
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