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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

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of Straits Times Index STI GJR-GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Jan 1, 1990 to Aug 14, 2026

Model 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

ParameterValuet-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