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Calamos S&P 500 Stru ETF JAN GJR-GARCH Volatility Analysis

Volatility prediction for Tuesday, September 8th, 2026

1 Day

1.91%

decreased by 0.07%

1 Week

2.00%

increased by 0.02%

1 Month

2.29%

increased by 0.31%

Analysis last updated: Saturday, September 5, 2026 at 02:21 AM UTC

Date Range:

from

to

6M ·

1Y ·

All

graph of Calamos S&P 500 Stru ETF JAN GJR-GARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Jan 2, 2025 to Sep 4, 2026

Model Insight

Volatility shocks decay with a half-life of 55 trading days, meaning a shock loses half its impact after approximately 55 days.

σ

GJR-GARCH Model

Tap to view equation

Shock decay: Shocks decay with a 55-day half-life
ParamValuet-stat
ωconst0.0009
0.91
αARCH0.0000
0.00
βGARCH0.8775
18.56***
γleverage0.2202
1.49

0.988

Persistence

55d

Half-life
σ

GJR-GARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.0009
0.91
α

ARCH

Response to squared shocks

0.0000
0.00
β

GARCH

Volatility persistence

0.8775
18.56***
γ

leverage

Additional response to negative shocks

0.2202
1.49

Persistence:

0.988

Half-life:

55 days