V-Lab
Straits Times Index STI MEM Volatility Analysis
Volatility prediction for Wednesday, August 12th, 2026
1 Day
16.26%
increased by 2.89%
1 Week
16.33%
increased by 2.96%
1 Month
16.60%
increased by 3.23%
Analysis last updated: Tuesday, August 11, 2026 at 10:13 AM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jun 9, 1992 to Aug 7, 2026Model Insight
Volatility shocks decay with a half-life of 50 trading days, meaning a shock loses half its impact after approximately 50 days.
μ
MEM Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0194 | 7.31*** |
α ARCH Response to squared shocks | 0.1930 | 46.83*** |
β GARCH Volatility persistence | 0.7931 | 279.76*** |
Persistence:
0.986
Half-life:
50 days
Other MEM Analyses on Equity Indices