V-Lab
Boston Scientific Corp EGARCH Volatility Analysis
Volatility prediction for Monday, September 21st, 2026
1 Day
44.84%
decreased by 0.88%
1 Week
44.96%
decreased by 0.76%
1 Month
45.45%
decreased by 0.27%
Analysis last updated: Friday, September 18, 2026 at 11:14 PM UTC
News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
May 20, 1992 to Sep 18, 2026Model Insight
With persistence 0.991, volatility shocks have a half-life of 75 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 352% more than positive returns
σ
EGARCH Model
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High persistence: persistence 0.991, shock half-life ~75 daysLeverage: Negative returns increase volatility 352% more than positive returns
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.0221 | 2.27** |
| αARCH | 0.0799 | 6.64*** |
| βGARCH | 0.9908 | 309.51*** |
| γleverage | -0.0510 | -4.29*** |
0.991
Persistence75d
Half-lifeσ
EGARCH Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0221 | 2.27** |
α ARCH Response to squared shocks | 0.0799 | 6.64*** |
β GARCH Volatility persistence | 0.9908 | 309.51*** |
γ leverage Additional response to negative shocks | -0.0510 | -4.29*** |
Persistence:
0.991
Half-life:
75 days
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