V-Lab
Straits Times Index STI GJR-GARCH Volatility Analysis
Volatility prediction for Monday, August 17th, 2026
1 Day
11.23%
decreased by 0.44%
1 Week
11.60%
decreased by 0.07%
1 Month
12.86%
increased by 1.19%
Analysis last updated: Friday, August 14, 2026 at 10:03 AM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 1, 1990 to Aug 14, 2026Model Insight
This asset exhibits a strong leverage effect: negative returns increase next-day volatility 153% more than equivalent positive returns.
σ
GJR-GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0254 | 27.13*** |
α ARCH Response to squared shocks | 0.0723 | 22.62*** |
β GARCH Volatility persistence | 0.8562 | 301.68*** |
γ leverage Additional response to negative shocks | 0.1107 | 15.13*** |
Persistence:
0.984
Half-life:
42 days
Other GJR-GARCH Analyses on Equity Indices