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General Motors Co Spline ILLIQ Liquidity Analysis

Illiquidity prediction for Monday, September 21st, 2026

1 Day

30.03

increased by 0.01

1 Week

29.84

decreased by 0.18

1 Month

29.72

decreased by 0.30

Analysis last updated: Friday, September 18, 2026 at 11:29 PM UTC

Date Range:

from

to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

All

graph of General Motors Co ILLIQ-SMEM

News Impact Curve

How returns affect tomorrow's illiquidity

Illiquidity Forecast

How illiquidity evolves over time

Parameter Estimates

Nov 18, 2010 to Sep 18, 2026

Model Insight

With persistence 0.996, illiquidity shocks have a half-life of 161 trading days (~0.6 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 0.996, shock half-life ~161 days
ParamValuet-stat
ωconst1.1595
7.55***
αARCH0.0696
10.04***
βGARCH0.9261
128.32***
γi Spline Coefficients
K=1
γ1-0.0112
-2.37**

0.996

Persistence

161d

Half-life
μ

ILLIQ-SMEM Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

1.1595
7.55***
α

ARCH

Response to squared shocks

0.0696
10.04***
β

GARCH

Volatility persistence

0.9261
128.32***
γi Spline Coefficients
K=1
γ1-0.0112
-2.37**

Persistence:

0.996

Half-life:

161 days