V-Lab
Aitken Spence Plc Spline ILLIQ Liquidity Analysis
Illiquidity prediction for Wednesday, September 9th, 2026
1 Day
9,593.62
decreased by 1,047.10
1 Week
10,567.90
decreased by 72.82
1 Month
11,379.77
increased by 739.05
Analysis last updated: Wednesday, September 9, 2026 at 08:23 PM UTC
News Impact Curve
How returns affect tomorrow's illiquidityIlliquidity Forecast
How illiquidity evolves over timeParameter Estimates
Aug 11, 1997 to Sep 4, 2026Model Insight
With persistence 0.993, illiquidity shocks have a half-life of 97 trading days (~0.4 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 0.993, shock half-life ~97 days
| Param | Value | t-stat |
|---|---|---|
| ωconst | 3.2216 | 1.29 |
| αARCH | 0.1665 | 5.65*** |
| βGARCH | 0.8264 | 31.62*** |
Spline Coefficients
K=10
| γ1 | 0.7199 | 1.68* |
| γ2 | -1.5152 | -2.73*** |
| γ3 | 1.8717 | 3.49*** |
| γ4 | -1.7476 | -1.98** |
| γ5 | 0.7774 | 0.84 |
| γ6 | -0.2428 | -0.38 |
| γ7 | 0.0205 | 0.05 |
| γ8 | 0.7653 | 2.13** |
| γ9 | -1.6121 | -6.33*** |
| γ10 | 1.9718 | 3.70*** |
0.993
Persistence97d
Half-lifeμ
ILLIQ-SMEM Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 3.2216 | 1.29 |
α ARCH Response to squared shocks | 0.1665 | 5.65*** |
β GARCH Volatility persistence | 0.8264 | 31.62*** |
Spline Coefficients
K=10
| γ1 | 0.7199 | 1.68* |
| γ2 | -1.5152 | -2.73*** |
| γ3 | 1.8717 | 3.49*** |
| γ4 | -1.7476 | -1.98** |
| γ5 | 0.7774 | 0.84 |
| γ6 | -0.2428 | -0.38 |
| γ7 | 0.0205 | 0.05 |
| γ8 | 0.7653 | 2.13** |
| γ9 | -1.6121 | -6.33*** |
| γ10 | 1.9718 | 3.70*** |
Persistence:
0.993
Half-life:
97 days
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