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State Street SPDR S&P 500 ETF Trust MF2-GARCH Volatility Analysis

Volatility prediction for Tuesday, September 29th, 2026

1 Day

11.73%

increased by 1.11%

1 Week

12.11%

increased by 1.49%

1 Month

13.22%

increased by 2.60%

Analysis last updated: Monday, September 28, 2026 at 09:56 PM UTC

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graph of State Street SPDR S&P 500 ETF Trust MF2-GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Jan 29, 1993 to Sep 25, 2026

Model Insight

This asset exhibits a strong leverage effect: volatility responds almost entirely to negative shocks. The ARCH response to positive shocks is negligible.

σ

MF2-GARCH Model

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Leverage: volatility responds almost entirely to negative shocks
ParamValuet-stat
mwindow61
αARCH0.0000
0.00
βGARCH0.8300
54.73***
γleverage0.2208
12.33***
λ₁tau intercept0.0121
1.60
λ₂forecast adj.0.0569
2.04**
λ₃tau persistence0.9324
27.90***

0.940

Persistence

11d

Half-life
σ

MF2-GARCH Model

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ParameterValuet-statistic
m

window

Rolling window length

61
α

ARCH

Response to squared shocks

0.0000
0.00
β

GARCH

Volatility persistence

0.8300
54.73***
γ

leverage

Additional response to negative shocks

0.2208
12.33***
λ₁

tau intercept

Baseline long-term coefficient

0.0121
1.60
λ₂

forecast adj.

Forecast performance sensitivity

0.0569
2.04**
λ₃

tau persistence

Long-term factor persistence

0.9324
27.90***

Persistence:

0.940

Half-life:

11 days