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Sonda S.A. GJR-GARCH Volatility Analysis

Volatility prediction for Tuesday, September 15th, 2026

1 Day

27.39%

decreased by 0.60%

1 Week

27.37%

decreased by 0.62%

1 Month

27.34%

decreased by 0.65%

Analysis last updated: Wednesday, September 16, 2026 at 03:17 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of Sonda S.A. GJR-GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Nov 9, 2006 to Sep 14, 2026

Model Insight

Volatility shocks decay with a half-life of 21 trading days, meaning a shock loses half its impact after approximately 21 days.

σ

GJR-GARCH Model

Tap to view equation

Shock decay: Shocks decay with a 21-day half-life
ParamValuet-stat
ωconst0.0942
3.99***
αARCH0.0398
3.35***
βGARCH0.8883
62.43***
γleverage0.0796
1.90*

0.968

Persistence

21d

Half-life
σ

GJR-GARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.0942
3.99***
α

ARCH

Response to squared shocks

0.0398
3.35***
β

GARCH

Volatility persistence

0.8883
62.43***
γ

leverage

Additional response to negative shocks

0.0796
1.90*

Persistence:

0.968

Half-life:

21 days