BTS | Table 1: Definitions of the Main Variables

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BTS Home > Publications > Journal of Transportation and Statistics > Volume 7 Number 1 > Paper 3

Table 1: Definitions of the Main Variables

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Name	Definition	Sample		Estimation		Forecasting
Name	Definition	Period	Size	Period	Size	Period	Size
Number of tickets/cards sold
SMT	Single-trip Metro	1987:1-2002:12	192	1987:1-1999:12	156	2000:1-2002:12	36
10MT	10-trip Metro	1987:1-2002:12	192	1987:1-1999:12	156	2000:1-2002:12	36
SBT	Single-trip bus	1988:1-2002:12	180	1988:1-1999:12	144	2000:1-2002:12	36
10BT	10-trip bus	1988:1-2002:12	180	1988:1-1999:12	144	2000:1-2002:12	36
TC	Monthly travel card	1987:1-2002:12	192	1991:1-1999:12	108	2000.1-2002:12	36
JTC	Junior monthly travel card	1988:2-2002:12	179	1991:1-1999:12	108	2000:1-2002:12	36
Rate of growth of deflated prices
ΔPSMT	SMT	1987:1-2002:12	192	1987:1-1999:12	156	2000:1-2002:12	36
ΔP10MT	10MT	1987:1-2002:12	192	1987:1-1999:12	156	2000:1-2002:12	36
ΔPSBT	SBT	1988:1-2002:12	180	1988:1-1999:12	144	2000:1-2002:12	36
ΔP10BT	10BT	1988:1-2002:12	180	1988:1-1999:12	144	2000:1-2002:12	36
ΔPTC	TC	1987:1-2002:12	192	1991:1-1999:12	108	2000:1-2002:12	36
ΔPJTC	JTC	1988:2-2002:12	179	1991:1-1999:12	108	2000:1-2002:12	36

Notes: All the variables measure the number of tickets/cards sold. TC and JTC are monthly passes that can be used without limit. The price variables are measured in rates of growth of deflated prices. The deflator used was the Consumer Price Index published monthly by the Instituto Nacional de Estadística of Spain.