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Carlos Casado Sa 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 Wednesday, September 16th, 2026

1 Day

9,199.09

increased by 1,038.88

1 Week

8,767.24

increased by 607.03

1 Month

11,041.81

increased by 2,881.60

Analysis last updated: Thursday, September 17, 2026 at 04:46 AM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of Carlos Casado Sa ILLIQ-SMEM

News Impact Curve

How returns affect tomorrow's illiquidity

Illiquidity Forecast

How illiquidity evolves over time

Parameter Estimates

Jul 29, 1994 to Sep 14, 2026

Model Insight

With persistence 1.000, illiquidity shocks have a half-life of 231049 trading days (~916.9 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 ~231049 days
ParamValuet-stat
ωconst83.3027
αARCH0.0883
βGARCH0.9117
γi Spline Coefficients
K=6
γ10.2455
γ2-0.4366
γ30.2201
γ40.2374
γ5-1.1047
γ62.3403

1.000

Persistence

231049d

Half-life
μ

ILLIQ-SMEM Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

83.3027
α

ARCH

Response to squared shocks

0.0883
β

GARCH

Volatility persistence

0.9117
γi Spline Coefficients
K=6
γ10.2455
γ2-0.4366
γ30.2201
γ40.2374
γ5-1.1047
γ62.3403

Persistence:

1.000

Half-life:

231049 days