V-Lab
Boston Scientific Corp Asy. MEM Volatility Analysis
Volatility prediction for Monday, September 14th, 2026
1 Day
48.00%
decreased by 2.23%
1 Week
47.88%
decreased by 2.35%
1 Month
47.41%
decreased by 2.82%
Analysis last updated: Friday, September 11, 2026 at 11:49 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
May 20, 1992 to Sep 11, 2026Model Insight
With persistence 0.990, volatility shocks have a half-life of 72 trading days (~0.3 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate.
Leverage: Negative returns increase volatility 52% more than positive returns
μ
AMEM Model
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High persistence: persistence 0.990, shock half-life ~72 daysLeverage: Negative returns increase volatility 52% more than positive returns
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.0637 | 4.80*** |
| αARCH | 0.0860 | 7.69*** |
| βGARCH | 0.8821 | 105.90*** |
| γleverage | 0.0446 | 2.12** |
0.990
Persistence72d
Half-lifeμ
AMEM Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0637 | 4.80*** |
α ARCH Response to squared shocks | 0.0860 | 7.69*** |
β GARCH Volatility persistence | 0.8821 | 105.90*** |
γ leverage Additional response to negative shocks | 0.0446 | 2.12** |
Persistence:
0.990
Half-life:
72 days
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