V-Lab
Post And Telecommunication 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 Friday, September 18th, 2026
1 Day
8,563.20
decreased by 1,535.82
1 Week
9,331.11
decreased by 767.91
1 Month
10,109.16
increased by 10.14
Analysis last updated: Friday, September 18, 2026 at 09:24 PM UTC
News Impact Curve
How returns affect tomorrow's illiquidityIlliquidity Forecast
How illiquidity evolves over timeParameter Estimates
Dec 23, 2008 to Sep 15, 2026Model Insight
With persistence 1.000, illiquidity shocks have a half-life of 10345 trading days (~41.1 years), close to a unit root, so long-run forecasts are highly sensitive to this estimate.
μ
ILLIQ-SMEM Model
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High persistence: persistence 1.000, shock half-life ~10345 days
| Param | Value | t-stat |
|---|---|---|
| ωconst | 1.1258 | 2.97*** |
| αARCH | 0.1689 | 0.98 |
| βGARCH | 0.8310 | 4.85*** |
Spline Coefficients
K=9
| γ1 | -2.9649 | -0.76 |
| γ2 | 6.1468 | 1.13 |
| γ3 | -5.5780 | -2.23** |
| γ4 | 3.4584 | 2.65*** |
| γ5 | -1.4086 | -1.94* |
| γ6 | -0.1688 | -0.23 |
| γ7 | 0.9878 | 1.27 |
| γ8 | -0.4004 | -0.43 |
| γ9 | -0.3550 | -0.29 |
1.000
Persistence10345d
Half-lifeμ
ILLIQ-SMEM Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 1.1258 | 2.97*** |
α ARCH Response to squared shocks | 0.1689 | 0.98 |
β GARCH Volatility persistence | 0.8310 | 4.85*** |
Spline Coefficients
K=9
| γ1 | -2.9649 | -0.76 |
| γ2 | 6.1468 | 1.13 |
| γ3 | -5.5780 | -2.23** |
| γ4 | 3.4584 | 2.65*** |
| γ5 | -1.4086 | -1.94* |
| γ6 | -0.1688 | -0.23 |
| γ7 | 0.9878 | 1.27 |
| γ8 | -0.4004 | -0.43 |
| γ9 | -0.3550 | -0.29 |
Persistence:
1.000
Half-life:
10345 days
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