V-Lab
Straits Times Index STI EGARCH Volatility Analysis
Volatility prediction for Friday, September 11th, 2026
1 Day
12.82%
increased by 0.74%
1 Week
13.05%
increased by 0.97%
1 Month
13.91%
increased by 1.83%
Analysis last updated: Thursday, September 10, 2026 at 10:11 AM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 1, 1990 to Sep 4, 2026Model Insight
This asset exhibits a notable leverage effect: negative returns increase next-day volatility 94% more than equivalent positive returns.
σ
EGARCH Model
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Leverage: Negative returns increase volatility 94% more than positive returns
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.0073 | 1.42 |
| αARCH | 0.2332 | 9.85*** |
| βGARCH | 0.9730 | 202.29*** |
| γleverage | -0.0745 | -3.99*** |
0.973
Persistence25d
Half-lifeσ
EGARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0073 | 1.42 |
α ARCH Response to squared shocks | 0.2332 | 9.85*** |
β GARCH Volatility persistence | 0.9730 | 202.29*** |
γ leverage Additional response to negative shocks | -0.0745 | -3.99*** |
Persistence:
0.973
Half-life:
25 days
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