V-Lab
AT&T Inc Spline ILLIQ Liquidity Analysis
High-persistence model: shocks decay very slowly, so the theoretical long-run value may not be practically meaningful
Illiquidity prediction for Monday, September 28th, 2026
1 Day
10.72
decreased by 0.66
1 Week
11.80
increased by 0.42
1 Month
12.82
increased by 1.44
Analysis last updated: Saturday, September 26, 2026 at 12:44 AM UTC
News Impact Curve
How returns affect tomorrow's illiquidityIlliquidity Forecast
How illiquidity evolves over timeParameter Estimates
Jan 2, 1990 to Sep 25, 2026Model Insight
With persistence 1.000, illiquidity shocks have a half-life of 346573 trading days (~1375.3 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate.
μ
ILLIQ-SMEM Model
Tap to view equation
High persistence: persistence 1.000, shock half-life ~346573 days
| Param | Value | t-stat |
|---|---|---|
| ωconst | 1.3860 | 0.49 |
| αARCH | 0.1023 | 0.05 |
| βGARCH | 0.8977 | 0.47 |
Spline Coefficients
K=2
| γ1 | 0.0161 | 0.02 |
| γ2 | -0.0586 | -0.53 |
1.000
Persistence346573d
Half-lifeμ
ILLIQ-SMEM Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 1.3860 | 0.49 |
α ARCH Response to squared shocks | 0.1023 | 0.05 |
β GARCH Volatility persistence | 0.8977 | 0.47 |
Spline Coefficients
K=2
| γ1 | 0.0161 | 0.02 |
| γ2 | -0.0586 | -0.53 |
Persistence:
1.000
Half-life:
346573 days
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