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, September 18th, 2026
1 Day
15.40%
1 Week
16.22%
1 Month
19.14%
Analysis last updated: Friday, September 18, 2026 at 09:58 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jul 13, 2005 to Sep 10, 2026Model Insight
With persistence 1.000, volatility shocks have a half-life of 1386294 trading days (~5501.2 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate.
Leverage: Negative returns increase volatility 55% more than positive returns
GJR-GARCH Model
Tap to view equation
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.0513 | 6.21*** |
| αARCH | 0.1504 | 6.21*** |
| βGARCH | 0.8086 | 52.56*** |
| γleverage | 0.0821 | 2.22** |
1.000
Persistence1386294d
Half-lifeGJR-GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0513 | 6.21*** |
α ARCH Response to squared shocks | 0.1504 | 6.21*** |
β GARCH Volatility persistence | 0.8086 | 52.56*** |
γ leverage Additional response to negative shocks | 0.0821 | 2.22** |
Persistence:
1.000
Half-life:
1386294 days
Other Vietnam Hanoi Stock Exchange Equity Index Analyses
Other GJR-GARCH Analyses on Equity Indices