5. Sensitivity test for policy implication
A sensitivity test was conducted using the overall model shown in Table 4 to identify the influence of travel distance (from an origin to a chosen station) and travel cost (from a chosen station to a destination) on the nearest station choice by holding other independent variables at their mean. The resulting sensitivity plot for all stations (Fig. 4a) indicates that the predicted probabilities of choosing nearest station decrease as travel distance increases for all five different travel fees, which are travelling over one zone ($2.70), two zones ($4.00), three zones ($4.90), four zones ($5.80) and five zones ($7.10). Generally, the closer the chosen station to the destination, the lower probability of a chosen station is the nearest train station to the origin, except when travelling over four zones ($5.80). In the Perth metropolitan area, only the Mandurah line extends over five zones. After closely examining the travel patterns of respondents who travelled by trains over four zones, we identified that 24% of them chose stations, mostly Murdoch station on the Mandurah line, even though they came from a location near other train lines. Interestingly, about 82% of these travelled by bus feeder services to the train station, which is a good example of commuter/work- based transit service. Fig. 4a also shows that the predicted probability of respondents choosing a station that is the nearest station to their origin is over 80% if travel distance from an origin to the chosen station is less than 800 m. However, when they have to travel over 10 km from an origin to the chosen station, the estimated probability of choosing the nearest station is still over 80% only for respondents travelling over five zones. For respondents travelling over less than five zones, the estimated probability dropped sharply, especially for respondents who travelled on trains within one zone, the estimated probability decreased to 39%. The station, which belongs to the travelling-over-five-zone category, is Warnbro: a captive station. While stations belonging to the travelling-within-one- zone category are non-captive stations. Lack of competition with surrounding stations has led to a bigger catchment area for Warnbro station, leaving the train users with less travel options. This demonstrates a certain level of transport disadvantage for the train users.
5. ความไวทดสอบนโยบายปริยาย A sensitivity test was conducted using the overall model shown in Table 4 to identify the influence of travel distance (from an origin to a chosen station) and travel cost (from a chosen station to a destination) on the nearest station choice by holding other independent variables at their mean. The resulting sensitivity plot for all stations (Fig. 4a) indicates that the predicted probabilities of choosing nearest station decrease as travel distance increases for all five different travel fees, which are travelling over one zone ($2.70), two zones ($4.00), three zones ($4.90), four zones ($5.80) and five zones ($7.10). Generally, the closer the chosen station to the destination, the lower probability of a chosen station is the nearest train station to the origin, except when travelling over four zones ($5.80). In the Perth metropolitan area, only the Mandurah line extends over five zones. After closely examining the travel patterns of respondents who travelled by trains over four zones, we identified that 24% of them chose stations, mostly Murdoch station on the Mandurah line, even though they came from a location near other train lines. Interestingly, about 82% of these travelled by bus feeder services to the train station, which is a good example of commuter/work- based transit service. Fig. 4a also shows that the predicted probability of respondents choosing a station that is the nearest station to their origin is over 80% if travel distance from an origin to the chosen station is less than 800 m. However, when they have to travel over 10 km from an origin to the chosen station, the estimated probability of choosing the nearest station is still over 80% only for respondents travelling over five zones. For respondents travelling over less than five zones, the estimated probability dropped sharply, especially for respondents who travelled on trains within one zone, the estimated probability decreased to 39%. The station, which belongs to the travelling-over-five-zone category, is Warnbro: a captive station. While stations belonging to the travelling-within-one- zone category are non-captive stations. Lack of competition with surrounding stations has led to a bigger catchment area for Warnbro station, leaving the train users with less travel options. This demonstrates a certain level of transport disadvantage for the train users.
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