V-Lab
Calamos S&P 500 Stru ETF JAN GJR-GARCH Volatility Analysis
Volatility prediction for Monday, August 17th, 2026
1 Day
2.16%
decreased by 0.09%
1 Week
2.24%
decreased by 0.01%
1 Month
2.49%
increased by 0.24%
Analysis last updated: Saturday, August 15, 2026 at 02:27 AM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 2, 2025 to Aug 14, 2026Model Insight
Volatility shocks decay with a half-life of 64 trading days, meaning a shock loses half its impact after approximately 64 days.
σ
GJR-GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0009 | 3.59*** |
α ARCH Response to squared shocks | 0.0000 | 0.00 |
β GARCH Volatility persistence | 0.8777 | 72.20*** |
γ leverage Additional response to negative shocks | 0.2232 | 5.95*** |
Persistence:
0.989
Half-life:
64 days
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