S&P Composite 1500 Index GARCH Volatility Analysis
Volatility prediction for Tuesday, November 3rd, 2026
1 Day
13.59%
decreased by 0.53%
1 Week
13.76%
decreased by 0.36%
1 Month
14.37%
increased by 0.25%
Analysis last updated: Tuesday, November 3, 2026 at 12:04 AM UTC
Press Delete or Backspace to remove this series.
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Oct 31, 1994 to Oct 30, 2026Model Insight
Volatility shocks decay with a half-life of 42 trading days, meaning a shock loses half its impact after approximately 42 days.
σ
GARCH Model
Tap to view equation
Shock decay: Shocks decay with a 42-day half-life
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.0217 | 5.21*** |
| αARCH | 0.1086 | 10.14*** |
| βGARCH | 0.8749 | 84.00*** |
0.983
Persistence42d
Half-lifeσ
GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0217 | 5.21*** |
α ARCH Response to squared shocks | 0.1086 | 10.14*** |
β GARCH Volatility persistence | 0.8749 | 84.00*** |
Persistence:
0.983
Half-life:
42 days
Other S&P Composite 1500 Index Analyses
Other GARCH Analyses on Equity Indices