V-Lab
SBA Communications Corp GJR-GARCH Volatility Analysis
Volatility prediction for Friday, October 2nd, 2026
1 Day
30.37%
decreased by 0.18%
1 Week
30.51%
decreased by 0.04%
1 Month
31.08%
increased by 0.53%
Analysis last updated: Thursday, October 1, 2026 at 10:56 PM UTC
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News Impact Curve
How returns affect tomorrow's volatilityVolatility Forecast
How volatility evolves over timeParameter Estimates
Jun 16, 1999 to Sep 25, 2026Model Insight
With persistence 0.999, volatility shocks have a half-life of 620 trading days (~2.5 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate.
Leverage: Negative returns increase volatility 178% more than positive returns
σ
GJR-GARCH Model
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High persistence: persistence 0.999, shock half-life ~620 daysLeverage: Negative returns increase volatility 178% more than positive returns
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.0216 | 3.62*** |
| αARCH | 0.0286 | 3.87*** |
| βGARCH | 0.9449 | 170.10*** |
| γleverage | 0.0508 | 3.07*** |
0.999
Persistence620d
Half-lifeσ
GJR-GARCH Model
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| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.0216 | 3.62*** |
α ARCH Response to squared shocks | 0.0286 | 3.87*** |
β GARCH Volatility persistence | 0.9449 | 170.10*** |
γ leverage Additional response to negative shocks | 0.0508 | 3.07*** |
Persistence:
0.999
Half-life:
620 days
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