V-Lab
Big Yellow Group PLC 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 Monday, September 21st, 2026
1 Day
2,939.59
decreased by 77.49
1 Week
3,030.74
increased by 13.66
1 Month
2,586.83
decreased by 430.25
Analysis last updated: Sunday, September 20, 2026 at 03:10 AM UTC
News Impact Curve
How returns affect tomorrow's illiquidityIlliquidity Forecast
How illiquidity evolves over timeParameter Estimates
May 5, 2000 to Sep 18, 2026Model Insight
With persistence 1.000, illiquidity shocks have a half-life of 693147 trading days (~2750.6 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 ~693147 days
| Param | Value | t-stat |
|---|---|---|
| ωconst | 1.5343 | 0.67 |
| αARCH | 0.0376 | 0.02 |
| βGARCH | 0.9624 | 0.51 |
Spline Coefficients
K=2
| γ1 | -0.0483 | -0.01 |
| γ2 | 0.0722 | 0.01 |
1.000
Persistence693147d
Half-lifeμ
ILLIQ-SMEM Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 1.5343 | 0.67 |
α ARCH Response to squared shocks | 0.0376 | 0.02 |
β GARCH Volatility persistence | 0.9624 | 0.51 |
Spline Coefficients
K=2
| γ1 | -0.0483 | -0.01 |
| γ2 | 0.0722 | 0.01 |
Persistence:
1.000
Half-life:
693147 days
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