V-Lab
Servair Abidjan Spline ILLIQ Liquidity Analysis
Illiquidity prediction for Monday, September 21st, 2026
1 Day
1,366.35
increased by 43.72
1 Week
1,382.76
increased by 60.13
1 Month
1,692.16
increased by 369.53
Analysis last updated: Saturday, September 19, 2026 at 10:19 PM UTC
News Impact Curve
How returns affect tomorrow's illiquidityIlliquidity Forecast
How illiquidity evolves over timeParameter Estimates
Jan 31, 2012 to Sep 18, 2026Model Insight
This model fits a time-varying baseline (a spline), so illiquidity mean-reverts toward a slowly-shifting long-run level rather than a constant. Short-run deviations decay with a half-life of 38 trading days.
μ
ILLIQ-SMEM Model
Tap to view equation
Time-varying baseline: illiquidity reverts to a slowly-shifting spline trend
| Param | Value | t-stat |
|---|---|---|
| ωconst | 0.8453 | 3.38*** |
| αARCH | 0.0229 | 2.67*** |
| βGARCH | 0.9590 | 45.56*** |
Spline Coefficients
K=9
| γ1 | -0.5555 | -0.85 |
| γ2 | 0.6391 | 0.66 |
| γ3 | 1.2257 | 2.09** |
| γ4 | -2.5539 | -4.41*** |
| γ5 | 1.5860 | 2.30** |
| γ6 | -0.2269 | -0.21 |
| γ7 | -1.0705 | -0.69 |
| γ8 | 1.5333 | 1.08 |
| γ9 | -1.3465 | -1.03 |
0.982
Persistence38d
Half-lifeμ
ILLIQ-SMEM Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 0.8453 | 3.38*** |
α ARCH Response to squared shocks | 0.0229 | 2.67*** |
β GARCH Volatility persistence | 0.9590 | 45.56*** |
Spline Coefficients
K=9
| γ1 | -0.5555 | -0.85 |
| γ2 | 0.6391 | 0.66 |
| γ3 | 1.2257 | 2.09** |
| γ4 | -2.5539 | -4.41*** |
| γ5 | 1.5860 | 2.30** |
| γ6 | -0.2269 | -0.21 |
| γ7 | -1.0705 | -0.69 |
| γ8 | 1.5333 | 1.08 |
| γ9 | -1.3465 | -1.03 |
Persistence:
0.982
Half-life:
38 days
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