V-Lab
Calamos S&P 500 ST AL PR ETF GJR-GARCH Volatility Analysis
Volatility prediction for Wednesday, August 26th, 2026
1 Day
1.30%
decreased by 0.02%
1 Week
1.35%
increased by 0.03%
1 Month
1.49%
increased by 0.17%
Analysis last updated: Wednesday, August 26, 2026 at 02:18 AM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Apr 1, 2025 to Aug 21, 2026Model Insight
Volatility shocks decay with a half-life of 13 trading days, meaning a shock loses half its impact after approximately 13 days.
σ
GJR-GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0006 | 4.16*** |
α ARCH Response to squared shocks | 0.0000 | 0.00 |
β GARCH Volatility persistence | 0.8884 | 78.40*** |
γ leverage Additional response to negative shocks | 0.1155 | 2.73*** |
Persistence:
0.946
Half-life:
13 days
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