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V-Lab

State Street Health Care Select Sector SPDR ETF GJR-GARCH Volatility Analysis

Volatility prediction for Monday, July 27th, 2026

1 Day

16.27%

decreased by 0.70%

1 Week

16.37%

decreased by 0.60%

1 Month

16.69%

decreased by 0.28%

Analysis last updated: Friday, July 24, 2026 at 10:56 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of State Street Health Care 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 Jul 24, 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

GJR-GARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.0299
20.82***
α

ARCH

Response to squared shocks

0.0244
7.73***
β

GARCH

Volatility persistence

0.8820
285.45***
γ

leverage

Additional response to negative shocks

0.1424
17.95***

Persistence:

0.978

Half-life:

31 days