V-Lab
Russell Midcap Index MEM Volatility Analysis
Volatility prediction for Friday, September 4th, 2026
1 Day
10.86%
decreased by 0.10%
1 Week
11.41%
increased by 0.45%
1 Month
13.09%
increased by 2.13%
Analysis last updated: Friday, September 4, 2026 at 11:26 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Mar 1, 2004 to Aug 27, 2026Model Insight
Volatility shocks decay with a half-life of 27 trading days, meaning a shock loses half its impact after approximately 27 days.
μ
MEM Model
Tap to view equation
Shock decay: Shocks decay with a 27-day half-life
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.0366 | 2.66*** |
| αARCH | 0.2576 | 12.19*** |
| βGARCH | 0.7171 | 47.85*** |
0.975
Persistence27d
Half-lifeμ
MEM Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0366 | 2.66*** |
α ARCH Response to squared shocks | 0.2576 | 12.19*** |
β GARCH Volatility persistence | 0.7171 | 47.85*** |
Persistence:
0.975
Half-life:
27 days
Other Russell Midcap Index Analyses
Other MEM Analyses on Equity Indices