V-Lab
Shell Plc Spline ILLIQ Liquidity Analysis
Illiquidity prediction for Friday, September 11th, 2026
1 Day
4,460.12
decreased by 193.67
1 Week
4,858.49
increased by 204.70
1 Month
6,175.02
increased by 1,521.23
Analysis last updated: Friday, September 11, 2026 at 07:13 PM UTC
News Impact Curve
How returns affect tomorrow's illiquidityIlliquidity Forecast
How illiquidity evolves over timeParameter Estimates
Jan 10, 2013 to Sep 4, 2026Model Insight
With persistence 0.998, illiquidity shocks have a half-life of 336 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 ~336 days
| Param | Value | t-stat |
|---|---|---|
| ωconst | 1.0588 | 6.90*** |
| αARCH | 0.0919 | 11.10*** |
| βGARCH | 0.9060 | 112.09*** |
Spline Coefficients
K=1
| γ1 | -0.0065 | -0.47 |
0.998
Persistence336d
Half-lifeμ
ILLIQ-SMEM Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 1.0588 | 6.90*** |
α ARCH Response to squared shocks | 0.0919 | 11.10*** |
β GARCH Volatility persistence | 0.9060 | 112.09*** |
Spline Coefficients
K=1
| γ1 | -0.0065 | -0.47 |
Persistence:
0.998
Half-life:
336 days
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