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State Street SPDR Portfolio Aggregate Bond ETF EGARCH Volatility Analysis

Volatility prediction for Tuesday, September 8th, 2026

1 Day

3.91%

decreased by 0.29%

1 Week

3.94%

decreased by 0.26%

1 Month

4.06%

decreased by 0.14%

Analysis last updated: Friday, September 4, 2026 at 10:49 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of State Street SPDR Portfolio Aggregate Bond ETF EGARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

May 30, 2007 to Sep 4, 2026

Model Insight

Volatility shocks decay with a half-life of 58 trading days, meaning a shock loses half its impact after approximately 58 days.

σ

EGARCH Model

Tap to view equation

Shock decay: Shocks decay with a 58-day half-life
ParamValuet-stat
ωconst-0.0250
-2.67***
αARCH0.1878
5.38***
βGARCH0.9882
267.08***
γleverage-0.0322
-1.38

0.988

Persistence

58d

Half-life
σ

EGARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

-0.0250
-2.67***
α

ARCH

Response to squared shocks

0.1878
5.38***
β

GARCH

Volatility persistence

0.9882
267.08***
γ

leverage

Additional response to negative shocks

-0.0322
-1.38

Persistence:

0.988

Half-life:

58 days