V-Lab
iShares Core S&P U.S. Growth ETF GJR-GARCH Volatility Analysis
Volatility prediction for Thursday, August 27th, 2026
1 Day
14.18%
decreased by 0.50%
1 Week
14.35%
decreased by 0.33%
1 Month
14.92%
increased by 0.24%
Analysis last updated: Wednesday, August 26, 2026 at 10:17 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jul 28, 2000 to Aug 21, 2026Model Insight
Volatility shocks decay with a half-life of 40 trading days, meaning a shock loses half its impact after approximately 40 days.
σ
GJR-GARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0230 | 15.62*** |
α ARCH Response to squared shocks | 0.0000 | 0.00 |
β GARCH Volatility persistence | 0.9053 | 304.31*** |
γ leverage Additional response to negative shocks | 0.1554 | 27.15*** |
Persistence:
0.983
Half-life:
40 days
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