A Case Study in China to Determine Whether GPS Data and Derivative Indicator Can Be Used to Identify Risky Drivers

Table 11

Summarization of the notation used in this case.

Parameter	Notation	Example
		Speed (km/h)	Acceleration (m/s^2)
L	Time series L=l1,…,ln	Lv	La
n	Length of a time series, n	nv =1000 s	na  = 1000 s
L’	Standardized time series L’=l’1,…,l’n	L’v	L’a
	PAA of a time series =,…,
w	Number of PAA segments representing time series L (w<<n)	=10	=20
	Symbol representation of a time series =,…,
α	Alphabet size (e.g., for the alphabet = {a, b, c, d}, α = 4)	=4	=4