Permian Basin Royalty Trust 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 Friday, October 30th, 2026
1 Day
5,534.88
increased by 476.21
1 Week
5,281.09
increased by 222.42
1 Month
4,698.05
decreased by 360.62
Analysis last updated: Thursday, October 29, 2026 at 11:29 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
Jan 2, 1990 to Oct 23, 2026Model Insight
With persistence 1.000, illiquidity shocks have a half-life of 77016 trading days (~305.6 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 ~77016 days
| Param | Value | t-stat |
|---|---|---|
| ωconst | 1.1072 | 0.32 |
| αARCH | 0.0718 | 0.03 |
| βGARCH | 0.9282 | 0.35 |
Spline Coefficients
K=5
| γ1 | -0.2011 | -0.05 |
| γ2 | 0.1507 | 0.02 |
| γ3 | 0.1830 | 0.04 |
| γ4 | -0.1931 | -0.06 |
| γ5 | 0.0531 | 0.10 |
1.000
Persistence77016d
Half-lifeμ
ILLIQ-SMEM Model
Tap to view equation
| Parameter | Value | t-statistic |
|---|---|---|
ω const Unconditional variance weight | 1.1072 | 0.32 |
α ARCH Response to squared shocks | 0.0718 | 0.03 |
β GARCH Volatility persistence | 0.9282 | 0.35 |
Spline Coefficients
K=5
| γ1 | -0.2011 | -0.05 |
| γ2 | 0.1507 | 0.02 |
| γ3 | 0.1830 | 0.04 |
| γ4 | -0.1931 | -0.06 |
| γ5 | 0.0531 | 0.10 |
Persistence:
1.000
Half-life:
77016 days
Other Permian Basin Royalty Trust Analyses
Other Spline ILLIQ Analyses on Units