V-Lab
Straits Times Index STI GJR-GARCH Volatility Analysis
Volatility prediction for Monday, July 27th, 2026
1 Day
10.49%
decreased by 0.50%
1 Week
10.91%
decreased by 0.08%
1 Month
12.32%
increased by 1.33%
Analysis last updated: Friday, July 24, 2026 at 12:04 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 1, 1990 to Jul 24, 2026Model Insight
This asset exhibits a strong leverage effect: negative returns increase next-day volatility 154% more than equivalent positive returns.
σ
GJR-GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0254 | 27.11*** |
α ARCH Response to squared shocks | 0.0723 | 22.57*** |
β GARCH Volatility persistence | 0.8559 | 301.28*** |
γ leverage Additional response to negative shocks | 0.1112 | 15.15*** |
Persistence:
0.984
Half-life:
43 days
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