Practical Minimum Sample Size for Road Crash Time-Series Prediction Models

Table 6

The forecast error of the best-fit models for year 2017.

Country	Sample size	Observed	Forecast	Error	Error (%)
Denmark	45	2864	2639	225	7.86
	35	2864	2091	773	26.99
	25	2864	2003	861	30.06
	15	2864	2119	745	26.01
Turkey	45	182669	201597	−18928	−10.36
	35	182669	204089	−21420	−11.73
	25	182669	214840	−32171	−17.61
	15	182669	218131	−35462	−19.41
Germany	45	302656	306144	−3488	−1.15
	35	302656	303456	−800	−0.26
	25	302656	302712	−56	−0.02
	15	302656	304741	−2085	−0.69
Israel	45	13628	11979	1649	12.10
	35	13628	11329	2299	16.87
	25	13628	11096	2532	18.58
	15	13628	11961	1667	12.23