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V-Lab

Siemens AG AGARCH Volatility Analysis

Volatility prediction for Friday, September 4th, 2026

1 Day

26.10%

decreased by 0.36%

1 Week

26.17%

decreased by 0.29%

1 Month

26.43%

decreased by 0.03%

Analysis last updated: Friday, September 4, 2026 at 06:51 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

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graph of Siemens AG AGARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Jan 2, 1990 to Aug 28, 2026

Model Insight

With persistence 0.993, volatility shocks have a half-life of 98 trading days (~0.4 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate.

Asymmetry: negative returns raise volatility more

σ

AGARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.0170
1.83*
α

ARCH

Response to squared shocks

0.0483
8.83***
β

GARCH

Volatility persistence

0.9447
161.26***
γ

leverage

Additional response to negative shocks

0.4328
3.22***

Persistence:

0.993

Half-life:

98 days