Calamos S&P 500 Stru ETF JAN Zero Slope Spline-GARCH Volatility Analysis
Volatility prediction for Tuesday, October 20th, 2026
1 Day
1.52%
increased by 0.01%
1 Week
1.61%
increased by 0.10%
1 Month
1.79%
increased by 0.28%
Analysis last updated: Tuesday, October 20, 2026 at 02:24 AM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 2, 2025 to Oct 16, 2026Model Insight
This model fits a time-varying baseline (a spline), so volatility mean-reverts toward a slowly-shifting long-run level rather than a constant. Short-run deviations decay with a half-life of 9 trading days.
τ
Zero Slope Spline-GARCH Model
Tap to view equation
Time-varying baseline: volatility reverts to a slowly-shifting spline trend
| Param | Value | t-stat |
|---|---|---|
| ωconst | 1.3989 | 4.81*** |
| αARCH | 0.1344 | 2.18** |
| βGARCH | 0.7907 | 7.73*** |
Spline Coefficients
K=1
| γ1 | 0.3359 | 3.16*** |
0.925
Persistence9d
Half-lifeτ
Zero Slope Spline-GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 1.3989 | 4.81*** |
α ARCH Response to squared shocks | 0.1344 | 2.18** |
β GARCH Volatility persistence | 0.7907 | 7.73*** |
Spline Coefficients
K=1
| γ1 | 0.3359 | 3.16*** |
Persistence:
0.925
Half-life:
9 days
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