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V-Lab

State Street SPDR Portfolio S&P 500 Value ETF EGARCH Volatility Analysis

Volatility prediction for Monday, August 17th, 2026

1 Day

8.00%

decreased by 0.29%

1 Week

8.30%

increased by 0.01%

1 Month

9.49%

increased by 1.20%

Analysis last updated: Friday, August 14, 2026 at 10:42 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of State Street SPDR Portfolio S&P 500 Value ETF EGARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Oct 2, 2000 to Aug 14, 2026

Model Insight

The leverage effect is captured by the negative gamma (gamma = -0.1384), confirming that negative shocks increase volatility more than positive shocks of equal magnitude.

σ

EGARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.0036
1.06
α

ARCH

Response to squared shocks

0.1360
25.67***
β

GARCH

Volatility persistence

0.9749
652.12***
γ

leverage

Additional response to negative shocks

-0.1383
-37.64***

Persistence:

0.975

Half-life:

27 days