Table 1: Definitions of the Main Variables

Table 1: Definitions of the Main Variables

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Name Definition Sample Estimation Forecasting
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 Estadstica of Spain.