Grafton Group PLC Spline ILLIQ Liquidity Analysis
Illiquidity prediction for Monday, November 9th, 2026
1 Day
6,455.19
increased by 1,082.41
1 Week
6,006.72
increased by 633.94
1 Month
5,164.08
decreased by 208.70
Analysis last updated: Sunday, November 8, 2026 at 03:39 AM UTC
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News Impact Curve
How returns affect tomorrow's illiquidityIlliquidity Forecast
How illiquidity evolves over timeParameter Estimates
May 14, 2001 to Nov 6, 2026Model Insight
With persistence 0.998, illiquidity shocks have a half-life of 333 trading days (~1.3 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 0.998, shock half-life ~333 days
| Param | Value | t-stat |
|---|---|---|
| ωconst | 1.8615 | 3.92*** |
| αARCH | 0.1842 | 16.63*** |
| βGARCH | 0.8137 | 73.16*** |
Spline Coefficients
K=6
| γ1 | -0.6621 | -3.27*** |
| γ2 | 2.1085 | 4.77*** |
| γ3 | -4.0213 | -6.90*** |
| γ4 | 5.3116 | 7.50*** |
| γ5 | -3.8378 | -7.32*** |
| γ6 | 1.1732 | 5.56*** |
0.998
Persistence333d
Half-lifeμ
ILLIQ-SMEM Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 1.8615 | 3.92*** |
α ARCH Response to squared shocks | 0.1842 | 16.63*** |
β GARCH Volatility persistence | 0.8137 | 73.16*** |
Spline Coefficients
K=6
| γ1 | -0.6621 | -3.27*** |
| γ2 | 2.1085 | 4.77*** |
| γ3 | -4.0213 | -6.90*** |
| γ4 | 5.3116 | 7.50*** |
| γ5 | -3.8378 | -7.32*** |
| γ6 | 1.1732 | 5.56*** |
Persistence:
0.998
Half-life:
333 days
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