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V-Lab

State Street Technology Select Sector SPDR ETF GJR-GARCH Volatility Analysis

Volatility prediction for Tuesday, September 22nd, 2026

1 Day

20.58%

increased by 0.64%

1 Week

20.71%

increased by 0.77%

1 Month

21.19%

increased by 1.25%

Analysis last updated: Monday, September 21, 2026 at 09:52 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of State Street Technology Select Sector SPDR ETF GJR-GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Dec 22, 1998 to Sep 18, 2026

Model Insight

This asset exhibits a strong leverage effect: negative returns increase next-day volatility 377% more than equivalent positive returns.

σ

GJR-GARCH Model

Tap to view equation

Leverage: Negative returns increase volatility 377% more than positive returns
ParamValuet-stat
ωconst0.0290
4.21***
αARCH0.0313
2.48**
βGARCH0.8990
97.71***
γleverage0.1177
4.62***

0.989

Persistence

63d

Half-life
σ

GJR-GARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.0290
4.21***
α

ARCH

Response to squared shocks

0.0313
2.48**
β

GARCH

Volatility persistence

0.8990
97.71***
γ

leverage

Additional response to negative shocks

0.1177
4.62***

Persistence:

0.989

Half-life:

63 days