Table 1.

Trends in the log-transformed undocumented percentage of arrest charges: Augmented Dickey–Fuller time series test and linear trend test results

Test Type and Crime Category	Estimated value	Trend	Type	No. of lag terms
ADF test
Total felony	−0.002	Trendless	Random walk	3
Violent	−0.001	Trendless	Stationary	0
Property	−0.002*	Decrease	Stationary	0
Drug	−0.003*	Decrease	Random walk	3
Traffic	−0.003**	Decrease	Stationary	1
Linear trend test
Total felony	−0.002***	Decrease
Violent	−0.001	Trendless
Property	−0.002**	Decrease
Drug	−0.004***	Decrease
Traffic	−0.003***	Decrease

*P < 0.05; **P < 0.01; ***P < 0.001.