Vietnam Hanoi Stock Exchange Equity Index APARCH Volatility Analysis
Volatility prediction for Friday, July 17th, 2026
1 Day
35.63%
decreased by 2.87%
1 Week
35.37%
decreased by 3.13%
1 Month
34.50%
decreased by 4.00%
Analysis last updated: Friday, July 17, 2026 at 11:34 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
This asset exhibits a notable leverage effect: negative returns increase next-day volatility 59% more than equivalent positive returns. The volatility power δ = 1.53 sits below 2, so large shocks influence volatility less than quadratically, a more outlier-robust response than standard GARCH.
σ
APARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0589 | 27.99*** |
α ARCH Response to squared shocks | 0.1802 | 36.96*** |
β GARCH Volatility persistence | 0.8198 | 207.65*** |
γ leverage Additional response to negative shocks | 0.1493 | 10.37*** |
δ power Transformation power | 1.5315 | 24.26*** |
Persistence:
0.977
Half-life:
30 days
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