V-Lab
Wal-Mart Stores Inc MEM Volatility Analysis
Volatility prediction for Monday, September 14th, 2026
1 Day
21.30%
decreased by 0.67%
1 Week
21.48%
decreased by 0.49%
1 Month
22.15%
increased by 0.18%
Analysis last updated: Friday, September 11, 2026 at 11:36 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jan 2, 1990 to Sep 11, 2026Model Insight
Volatility shocks decay with a half-life of 67 trading days, meaning a shock loses half its impact after approximately 67 days.
μ
MEM Model
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Shock decay: Shocks decay with a 67-day half-life
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.0343 | 2.53** |
| αARCH | 0.1713 | 12.72*** |
| βGARCH | 0.8184 | 77.07*** |
0.990
Persistence67d
Half-lifeμ
MEM Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0343 | 2.53** |
α ARCH Response to squared shocks | 0.1713 | 12.72*** |
β GARCH Volatility persistence | 0.8184 | 77.07*** |
Persistence:
0.990
Half-life:
67 days
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