ACI Formulations PLC Spline ILLIQ Liquidity Analysis
Illiquidity prediction for Sunday, October 11th, 2026
1 Day
921.17
increased by 286.99
1 Week
761.63
increased by 127.45
1 Month
722.37
increased by 88.19
Analysis last updated: Friday, October 9, 2026 at 07:48 PM UTC
Press Delete or Backspace to remove this series.
News Impact Curve
How returns affect tomorrow's illiquidityIlliquidity Forecast
How illiquidity evolves over timeParameter Estimates
Feb 10, 2009 to Oct 8, 2026Model Insight
With persistence 1.000, illiquidity shocks have a half-life of 3431 trading days (~13.6 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 ~3431 days
| Param | Value | t-stat |
|---|---|---|
| ωconst | 1.0420 | 6.31*** |
| αARCH | 0.3136 | 6.59*** |
| βGARCH | 0.6862 | 14.41*** |
Spline Coefficients
K=6
| γ1 | -0.7813 | -1.63 |
| γ2 | 0.4796 | 0.79 |
| γ3 | 1.0980 | 4.63*** |
| γ4 | -2.0522 | -8.30*** |
| γ5 | 2.7292 | 4.67*** |
| γ6 | -3.0143 | -2.07** |
1.000
Persistence3431d
Half-lifeμ
ILLIQ-SMEM Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 1.0420 | 6.31*** |
α ARCH Response to squared shocks | 0.3136 | 6.59*** |
β GARCH Volatility persistence | 0.6862 | 14.41*** |
Spline Coefficients
K=6
| γ1 | -0.7813 | -1.63 |
| γ2 | 0.4796 | 0.79 |
| γ3 | 1.0980 | 4.63*** |
| γ4 | -2.0522 | -8.30*** |
| γ5 | 2.7292 | 4.67*** |
| γ6 | -3.0143 | -2.07** |
Persistence:
1.000
Half-life:
3431 days
Other ACI Formulations PLC Analyses
Other Spline ILLIQ Analyses on International Equities