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V-Lab

Straits Times Index STI MF2-GARCH Volatility Analysis

Volatility prediction for Monday, September 28th, 2026

1 Day

11.05%

decreased by 0.30%

1 Week

11.58%

increased by 0.23%

1 Month

12.55%

increased by 1.20%

Analysis last updated: Friday, September 25, 2026 at 10:04 AM UTC

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graph of Straits Times Index STI MF2-GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Jan 1, 1990 to Sep 25, 2026

Model Insight

This asset exhibits a strong leverage effect: negative returns increase next-day volatility 300% more than equivalent positive returns.

σ

MF2-GARCH Model

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Leverage: Negative returns increase volatility 300% more than positive returns
ParamValuet-stat
mwindow86
αARCH0.0443
4.47***
βGARCH0.8137
50.27***
γleverage0.1332
6.55***
λ₁tau intercept0.1126
3.36***
λ₂forecast adj.0.8951
14.62***
λ₃tau persistence0.0000
0.00

0.925

Persistence

9d

Half-life
σ

MF2-GARCH Model

Tap to view equation

ParameterValuet-statistic
m

window

Rolling window length

86
α

ARCH

Response to squared shocks

0.0443
4.47***
β

GARCH

Volatility persistence

0.8137
50.27***
γ

leverage

Additional response to negative shocks

0.1332
6.55***
λ₁

tau intercept

Baseline long-term coefficient

0.1126
3.36***
λ₂

forecast adj.

Forecast performance sensitivity

0.8951
14.62***
λ₃

tau persistence

Long-term factor persistence

0.0000
0.00

Persistence:

0.925

Half-life:

9 days