Table 3: Definitions of Intervention Variables

Table 3: Definitions of Intervention Variables

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Name Definition Facts Affected variables
EASTER 1 in Easter months, 0 otherwise Easter effects All
DAYS Trading days per month Trading day effects All
Mar-89 1 in 1989:3, 0 otherwise Strike in bus mode and large increase in single-ticket prices SMT, 10MT
Mar-90 1 in 1990:3, 0 otherwise Strike in bus mode SMT, SBT, 10BT
Apr-90 1 in 1990:4, 0 otherwise Strike in bus mode and large increase in single-ticket prices 10MT, 10BT
Jan-91 1 in 1991:1, 0 otherwise Strike in Metro mode and large increase in single-ticket prices SMT
Apr-91 1 in 1991:4, 0 otherwise Strike in Metro mode SMT
Feb-92 1 in 1992:2, 0 otherwise Strike in bus mode SMT, SBT, 10BT
Mar-92 1 in 1992:3, 0 otherwise Strike in bus mode SBT, 10BT
Apr-92 1 in 1992:4, 0 otherwise Consequences of bus strikes SBT
Jan-98 1 from 1998:1, 0 otherwise Introduction of the Metrobus ticket SMT, SBT
Feb-93 1 in 1993:2, 0 otherwise ? JTC
Apr-93 1 in 1993:4, 0 otherwise Metro service interruption JTC
Apr-93 1 in 1993:4, 0 otherwise Temporary closing of certain lines  
Mar-94 1 in 1994:3, 0 otherwise ? TC, JTC
Jul-95 1 in 1995:7, 0 otherwise ? JTC

Key: ? = no known explanation for this intervention variable.