V-Lab
Ishares S&P 500 EX S&P 1 ETF AGARCH Volatility Analysis
Volatility prediction for Thursday, August 20th, 2026
1 Day
13.60%
unchanged at 0.00%
1 Week
13.60%
unchanged at 0.00%
1 Month
13.60%
unchanged at 0.00%
Analysis last updated: Wednesday, August 19, 2026 at 09:46 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jul 9, 2025 to Aug 14, 2026Model Insight
Volatility shocks decay with a half-life of 43 trading days, meaning a shock loses half its impact after approximately 43 days.
σ
AGARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0119 | 5.13*** |
α ARCH Response to squared shocks | 0.0000 | 0.00 |
β GARCH Volatility persistence | 0.9838 | 146.78*** |
γ leverage Additional response to negative shocks | 0.0280 | 0.62 |
Persistence:
0.984
Half-life:
43 days
Other Ishares S&P 500 EX S&P 1 ETF Analyses
Other AGARCH Analyses on ETFs