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V-Lab

Siemens AG GJR-GARCH Volatility Analysis

Volatility prediction for Tuesday, July 14th, 2026

1 Day

32.01%

decreased by 0.70%

1 Week

31.99%

decreased by 0.72%

1 Month

31.91%

decreased by 0.80%

Analysis last updated: Tuesday, July 14, 2026 at 06:39 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of Siemens AG GJR-GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Jan 2, 1990 to Jul 10, 2026

Model Insight

With persistence 0.994, volatility shocks have a half-life of 119 trading days (~0.5 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate.

Leverage: Negative returns increase volatility 154% more than positive returns

σ

GJR-GARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.0210
9.72***
α

ARCH

Response to squared shocks

0.0242
15.02***
β

GARCH

Volatility persistence

0.9514
689.93***
γ

leverage

Additional response to negative shocks

0.0372
10.55***

Persistence:

0.994

Half-life:

119 days