V-Lab
State Street SPDR Portfolio Aggregate Bond ETF MF2-GARCH Volatility Analysis
Volatility prediction for Monday, September 14th, 2026
1 Day
4.50%
decreased by 0.20%
1 Week
4.50%
decreased by 0.20%
1 Month
4.42%
decreased by 0.28%
Analysis last updated: Friday, September 11, 2026 at 11:54 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
May 30, 2007 to Sep 11, 2026Model Insight
This asset exhibits a notable leverage effect: negative returns increase next-day volatility 77% more than equivalent positive returns.
σ
MF2-GARCH Model
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Leverage: Negative returns increase volatility 77% more than positive returns
| Param | Value | t-stat |
|---|---|---|
| mwindow | 126 | |
| αARCH | 0.0553 | 3.73*** |
| βGARCH | 0.8929 | 58.09*** |
| γleverage | 0.0426 | 2.19** |
| λ₁tau intercept | 0.0110 | 2.19** |
| λ₂forecast adj. | 0.8646 | 17.02*** |
| λ₃tau persistence | 0.0000 | 0.00 |
0.970
Persistence22d
Half-lifeσ
MF2-GARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
m window Rolling window length | 126 | |
α ARCH Response to squared shocks | 0.0553 | 3.73*** |
β GARCH Volatility persistence | 0.8929 | 58.09*** |
γ leverage Additional response to negative shocks | 0.0426 | 2.19** |
λ₁ tau intercept Baseline long-term coefficient | 0.0110 | 2.19** |
λ₂ forecast adj. Forecast performance sensitivity | 0.8646 | 17.02*** |
λ₃ tau persistence Long-term factor persistence | 0.0000 | 0.00 |
Persistence:
0.970
Half-life:
22 days
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