Determinants of “Travel with Dignity” of Passengers of MRT3 Jocelyn BULURAN a, Geoffrey CUETO b, Riches BACERO c Ereen Jenicka ALVAZREZ d, Dranyel CARAGAY e, Ruth Angela NOGUERA f a,b,c,d,ef School of Civil Environmental and Geological Engineering, Mapua Institute of Technology, Intramuros, Manila, Philippines a E-mail: [email protected] b E-mail: [email protected] c E-mail: [email protected] Abstract: Metro systems act as fast and efficient transport systems for many modern metropolises; however, the level of travel as far as the quality of service is at stake right now. This study has aimed to focus on identifying the determinants of travel with dignity among the passengers of MRT-3 by relating the railway service quality attributes and customer satisfaction based on passenger perception by providing safety, security, convenience and comfort to the passengers they experience travel with dignity. These parameters is based on the attributes, like spacing, seating condition, facilities and etc., through the passengers’ viewpoint so that users’ expectations and needs can be met. The results of the study provided recommendations in service assessment, betterment and improvement process of MRT-3 operation. Keywords: Transportation, Perception, Passenger, Travel with Dignity, Service 1. INTRODUCTION 1.1 Background The Metro Rail Transit 3 (MRT-3) is the cornerstone of the Department of Transportation & Communication's integrated strategy to alleviate the chronic traffic congestion experienced along the EDSA corridor. The Metro Rail system is designed to carry in excess of 23,000 passengers per hour per direction, initially, and is expandable to accommodate 48,000 passengers per hour, per direction. It is one of the most in demand mode of transportation here in Philippines. Every person has the right to travel but the level of the travel as far as the quality of service is at stake right now. People regardless of their races, income, and status in life had the right and the privilege of travel with dignity. 1.2 Statement of the Problem The use of MRT3 have been the fastest way to travel along Epifanio Delos Santos Avenue (EDSA) considering that the traffic congestion experienced in that part of Metro Manila is avoided. Because of this, many people prefer this as their mode of public transportation in order to save time and money. There is too much demand for its usage than it can actually serve well. Many passengers of MRT3 have been transported to their destination in the fastest way but many do not consider this a good mode of transportation because of the quality of its service. 1.3 Objective of the Study The aim of this study is to identify the determinants of travel with dignity among the passengers of MRT3. Specifically it aims: To operationally define travel with dignity To explore the relationship between railway service quality attributes and customer satisfaction based on passenger perception. To know the current level of service of MRT3 To provide recommendation in the enhancement of service assessment, betterment and improvement process of MRT3 operation and MRT3 service 1.4 Significance of the Study This study can be used to further improve the service of MRT3. Through this research, engineers can find different processes that can help them change the type of system that we have in handling that mode of transportation. People can use this study as inspiration to think of technological advancements that can improve the existing system we have. This study is important to civil engineering students who will be making their thesis as part of their requirement to graduate. The students can use this research as a future reference. This research can also be insights to the students to think of a related study that can make the MRT3 have a good quality ofservice.One distinctive contribution to the research community because it is one of the first few study regarding passenger perception. This study is important to a licensed civil engineer especially to transportation engineer whether how will they improve their service to the passengers using MRT 3.This study also benefits the people to be aware of the possible effects of using MRT3 to know the basis of a dignified travel. Involvement of people plays a key role to this study since their perception gives feedback mechanism and can be used to identify their concerns. 1.5 Scope and Limitation This paper is made to identify satisfaction situation regarding the present service quality of MRT3 in order to know whether this mode of transportation can still provide safety, convenience, comfortability and security to the passengers to ensure travel with dignity. The survey will be conducted on MRT3 only and the researchers will provide questionnaires to its passengers. Where in all stations are to be covered. 2. REVIEW OF RELATED LITERATURE According to the research of DuangpornPrasertsubpakij and Vilas Nitivattananon, entitled “Evaluating accessibility to Bangkok Metro Systems using multi-dimensional criteria across user groups”, Metro systems act as fast and efficient transport systems for many modern metropolises; however, enhancinghigher usage of such systems often conflicts with providing suitable accessibility options.The equal rights of all users are taken into account. Mostly people relied on Bangkok Metropolitan Region (BMR) transportationcalled “BTS Skytrain” and“MRT Subway”; however, accessing this transit treats some vulnerable groups, especially women, the elderly and disabled people unfairly. the researchers asked 600 people individually at various stations based on their survey people considers accessibility aspects of spatial, feederconnectivity, temporal, comfort/safety, psychosocial and other dimensions. The study suggests that, to balance the access priorities ofgroups on services, policy actions should emphasize acceptably safe access for individuals, cost efficient feederservices connecting the metro lines, socioeconomic influences and time allocation. Steer Davies Gleave, an organization in London, conducted a study on railway passenger service quality valuation from December 1999 to June 2000. This study was used to know how important the passengers in improving the service on stations and the quality of service in trains. This study aimed to provide some parameters on their assessment for railway service. It also gives emphasis on monetary evaluation for number of passengers. Passenger satisfaction was the focused of the study that is why those parameters that affect the service quality attributes were provided. They have used 22 attributes to conduct the railway passenger quality. Fu, L and Xin, Y conducted a study last 2007 about the quality attributes affecting customer satisfaction for bus transit to know the relationship between global customer satisfaction and service attributes of public transport. The bus transit that was used by student of University of Calabria at Cossenza of South Italy in order to reach the campus was the model used by the researchers. The researchers used multivariate technique, factor analysis, regression analysis and analysis of variance to assess the interrelated dependency of attributes. According to Lind, D.A and Meson, R. D to summarize a large amount of data in manipulative way was the used of Factor Analysis because it identifies underlying variables or factors that explain the pattern of correlations within a set of observed variables. Another researcher named Malhotra used this technique to determine the factors that influence the quality of railway service. He said that overall railway service is interdependent on the service attributes. A linear model was used to state overall satisfaction and other service attributes independent variable. Somehow regression model also can be used to interrelate overall satisfaction and service attributes of railway. According to the study of Choocharukul and Sriroongvikrai one of the service quality indicators for urban rail transit system is the service evaluation from a passenger's viewpoint. The key objective of service quality analysis is to improve services such that user expectations and needs can be met. In their study, data was collected from 661 respondents by means of questionnaire survey. Based on 31 service quality attributes, relationships between the overall customer satisfaction and service quality attributes are analyzed using factor analysis and structural equation modeling. Results indicate that travel convenience is the most significant factor affecting the overall satisfaction. Other factors include transit fare, service and information, cleanliness and safety, transit facilities, and access/egress to stations. Furthermore, market segmentation analysis reveals distinct findings across four categories of MRT users. It is expected that results can be used to enhance the overall performance of urban rail system. The satisfaction of transit customer has been studied in several aspects. For example, in California, Weinstein (1998) gathered survey data from San Francisco Bay Area Rapid Transit District (BART). Bivariate correlation and factor analysis of over 5000 respondents in terms of 43 service characteristics revealed 7 key service factors, namely, station cleanliness, train cleanliness and comfort , service and information timeliness, station entry and exit, police presence, parking, and policy enforcement. In 2007, Nathanail published a study about 22 service quality indicators; which were grouped into 6 categories, namely; itinerary accuracy, system safety, cleanness, passenger comfort, servicing, and passenger information. Among the six, itinerary accuracy and system safety were attributed the highest grades among all categories. This conclusion was based on empirical analysis on passengers using Hellenic Railways through different time horizons. Using the Dutch Railways customer satisfaction survey, Brons et al. (2009) evaluated the importance of access to railway stations on the overall satisfaction. Through the use of a principal component analysis, it was found that passenger’s overall satisfaction partly depends on satisfaction with access facilities, especially for infrequent passengers. Travel comfort, travel time reliability, station organization and information, service schedule, dynamic information, price-quality ratio, accessibility, ticket service, personal safety, and personnel were other elements of rail journeys leading to passenger satisfaction. Based on Todd Litman’s (2008) journal entitled “Built for Comfort, Not Just Speed”, qualitative factors such as convenience, comfort, security and prestige were amongst the elements travelers place a high value on. Unfortunately, conventional transport planning practices tend to focus on quantitative impacts and undervalue qualitative impacts. This paper describes ways to evaluate qualitative impacts. Using methods such as stated preference surveys (which ask people to value a particular option or impact) and revealed preference studies (which measure how people actually respond to an option or impact) (Forkenbrock and Weisbrod, 2001) can be used to measure factors such as traveler convenience and comfort. This information can be incorporated into transport planning and project evaluation through level-of-service (LOS) ratings, and by adjusting travel time values to better reflect travel conditions as discussed below. Level-of-service ratings are grades from A (best) to F (worst) commonly used to evaluate travel conditions and identify problem areas. LOS ratings are easy to understand and use, and carry considerable weight in decision-making since they are so similar to school grades – nobody wants to receive a bad grade. 3. METHODOLOGY Figure 1. Conceptual Framework The researchers used survey questionnaire for the execution of the survey. Also used a safety vest to distinguish the surveyors of the study and to provide unity or uniformity within the group. Also the researchers used laptop for storage of files, tally of the survey, and editing of the manuscript. The survey questions were proof read by the panel in our thesis defense proposal in thesis 1 and the researchers provided a copy to the MRT-3 operation for the review of questions the contents of the questionnaire focuses only to the demographic profile of the respondents, Importance of MRT-3 in their daily activity, Physical Factors of Travel With Dignity, Ranking of personal preference, and, operational definition of Travel with dignity. If a sample is taken from a population, a formula must be used to take into account confidence levels and margins of error. When taking statistical samples, sometimes a lot is known about a population, sometimes a little and sometimes nothing at all. Slovin's formula is written as: 𝑛= 𝑁 (1+𝑁𝑒 2 ) where, n N e : Number of samples : Total population : Error tolerance (1) Nonparametric or distribution-free procedures are used with increasing frequency by data analysts. There are many applications in science and engineering where the data are reported not as values on continuum but rather on an ordinal scale such that it is quite natural to assign ranks to the data. Most analysts find the computations involved in nonparametric methods to be very appealing and intuitive. A nonparametric measure of association between two variables X and Y is given by the rank correlation coefficient. 𝑟𝑠 = 1 − 2 6 ∑𝑛 𝑖=1 𝑑𝑖 (2) 𝑛(𝑛2 − 1) where, di n is the difference between the ranks assigned to xi and yi : is the number of pairs of data. : In practice the preceding formula is also used when there are ties among either the x or y observations. The ranks for tied observations are assigned as in the signed rank test by averaging the ranks that would have been assigned if the observations were distinguishable. The value of rs, will usually be close to the value obtained by finding r based on numerical measurements and is interpreted in much the same way. As before, the value of r s will range from -1 to +1. A value of +1 or -1 indicates perfect association between X and Y, the plus sign occurring for identical rankings and the minus sign occurring for reverse rankings. When rs is close to zero, the researchers would conclude that the variables are uncorrelated. 4. RESULTS AND DISCUSSIONS GENDER FEMALE, 122, 44% MALE, 155, 56% MALE FEMALE Figure 2. Gender Percentile of Correspondents Based on figure 2, 44% or 122 of the respondents are female while 56% or 155 of the respondents are male. It shows that the vast majority of the passengers are male. AGES BELOW 17 18 - 25 26 - 35 36 - 50 ABOVE 65, 1, 0% 51 - 65, 18, 7% 51 - 65 ABOVE 65 BELOW 17, 24, 9% 36 - 50, 18, 7% 26 - 35, 42, 16% 18 - 25, 161, 61% Figure 3. Age Percentile of Correspondents Age bracket percentile was divided into 6 groups: below 17, 18-25, 26-35, 36-50, 51-65 and 65 above. Pie chart shows that majority of the respondents are inside the age bracket of 18-25 years old that corresponds that they are young adults. AVERAGE MONTHLY INCOME ABOVE 50,OOOphp, 14, 5% 35,001php 50,000php, 32, 13% 10,000php AND BELOW , 112, 45% 20,001php 35,000php, 43, 17% 10,001php 20,000php, 50, 20% ABOVE 50,OOOphp 35,001php - 50,000php 10,001php - 20,000php 10,000php AND BELOW 20,001php - 35,000php Figure 4. Average Monthly Income Percentile of Correspondents The pie chart interprets that most of the respondent have an average monthly income of 10,000 php and below as represented by 45% of total respondents. PREGNANT, 13, 4% SOCIAL SECTOR SENIO R CITIZE N, 17, 6% UNEMPLOYE D, 20, 7% INDIGENOUS PEOPLE, 3, 1% PERSONS WITH DISABILITY ( PWD ), 10, 3% STUDENT EMPLOYED UNEMPLOYED STUDENT, 126, 41% PREGNANT SENIOR CITIZEN EMPLOYED, 114, 38% INDIGENOUS PEOPLE PERSONS WITH DISABILITY ( PWD ) Figure 5. Social Sector Percentile of Correspondents From the given diagram, majority of the respondents who are using MRT3 are students as represented by 41% while followed by employees represented by 38%. FACTORS CONSIDERED IN RIDING MRT - 3 140 120 117 101 100 60 84 80 80 57 62 49 47 27 40 39 22 57 56 40 39 25 73 61 25 41 38 31 25 23 26 20 0 RANK 1 RANK 2 RANK 3 RANK 4 RANK 5 SAFETY 101 25 25 41 57 SECURITY 49 80 39 56 25 COMFORT 47 57 84 38 23 CONVENIENCE 27 62 61 73 26 ECONOMICAL 39 22 40 31 117 SAFETY SECURITY COMFORT CONVENIENCE ECONOMICAL Figure 6. Factors considered by passengers of MRT – 3 From the expression of perception of the commuter pertains with the function of safety, security, comfort, convenience and economical. Among the 277 respondents majority concluded that safety is a needed perception that explains travel with dignity while most of the respondents explains that security, comfort, convenience and economical is also part of travel with dignity. IMPORTANCE OF MRT - 3 10 STRONGLY DISAGREE 15 DISAGREE 41 UNDECIDED 138 AGREE 62 STRONGLY AGREE 0 20 STRONGLY AGREE IMPORTANCE OF MRT - 3 62 40 60 80 100 120 AGREE UNDECIDED DISAGREE 138 41 15 140 STRONGLY DISAGREE 10 IMPORTANCE OF MRT - 3 Figure 7. Importance of MRT – 3 in their daily trips Based on the findings it overwhelmingly shows that MRT-3 is a very essential means of public transportation where majority of the Filipinos in Metro Manila are relatively using MRT-3. PHYSICAL FACTORS Variety of ticket types Value of train fare with respect to time/distance Ticketing Time Train Waiting Time Train line-haul time Travel Time Security inside the train Safety Caution Safety from crimes on trains Service announcement systems on trains Special fare for children/elderly Safety and security inside platforms Spacing for Moving Trains Spacing among seats Seat comfort on Train Pedestrian facility around stations Easiness to pass entrance gates Display of access/exit maps Display of transit fare information Cleanliness of Platform/Stations Cleanliness of train interior Convenience to trip destination Convenience from trip origin Comfort and Convenience at platform Announcement in the Station Availability of facilities for Persons With Disability Availability of personnel at platforms Availability of hand rails 0 20 40 60 80 100 120 140 160 180 PHYSICAL FACTORS Figure 8. External Factors that promote Travel with Dignity Out of the 28 external factors, the top 5 physical attributes that explains travel with dignity are seat comfort on train, comfort and convenience at platform, travel time, convenience from trip origin and convenience to trip destination. DEFINITION OF TRAVEL WITH DIGNITY FLEXIBLE INFORMATION EFFICIENT ACCESSIBILITY AFFORDABLE LARGE CAPACITY LOW ENVIRONMENTAL IMPACT CLEAN RELIABLE VISUAL AMENITIES CONVINIENT COMFORT FAST EFFECTIVE ECONOMICAL SECURITY SAFETY 0 20 40 60 80 100 120 140 160 180 200 DEFINITION OF TRAVEL WITH DIGNITY Figure 9. How the Passengers define Travel with Dignity (TWD) The survey reveals that to define operationally travel with dignity it pertains to travel that compasses safety features, security, comfort level, fast, cleanliness of the train, affordable, convenient, efficient, effective, and, economical. These are the majority of definition based on the passengers’ perception. SLOVIN'S FORMULA 𝑛= where, n N E : 278 : 472,697 : 0.06 472,697 (1+472,697(0.062 )) (3) Table 1. Factors in Riding MRT-3 FACTORS CONSIDERED IN RIDING MRT-3 RANK 1 RANK 2 RANK 3 RANK 4 Safety 101 49 47 27 Security 25 80 57 62 Comfort 25 39 84 61 Convenience 41 56 38 73 Economical 57 25 23 26 RANK 5 39 22 40 31 117 Groupings of physical attributes in relationship with passengers' perception Table 2. External Factors EXTERNAL FACTORS Availability of hand rails Availability of personnel at platforms Availability of facilities for disabled Announcement in the Station Comfort and Convenience at platform Convenience from trip origin Convenience to trip destination Cleanliness of train interior Cleanliness of platforms/stations Display of transit fare information Display of access/exit maps Easiness to pass entrance gates Pedestrian facility around stations Seat comfort on Train Spacing among seats Spacing for Moving Trains Safety and security inside platforms Special fare for children/elderly Service announcement systems on trains’ Safety from crimes on trains Safety Caution Security inside the train Travel Time Train line-haul time Train Waiting Time Ticketing Time Value of train fare with respect to time/distance Variety of ticket types 115 106 109 114 160 148 147 140 129 87 87 107 84 166 110 81 143 96 96 137 114 142 149 91 141 103 94 80 SAFETY SECURITY COMFORT CONVENIENCE ECONOMICAL Average of Tally under SAFETY: 115+71.5+137+114 4 = 109.375 (4) Average of Tally under SECURITY: 106+71.5+142 3 = 106.5 (5) = 115.25 (6) Average of Tally under COMFORT: 109+80+140+129+84+166+110+81+149+91+141+103 12 Average of Tally under CONVENIENCE: 114+80+148+147+87+107+80 7 = 109 (7) Average of Tally under ECONOMICS: 87+96+94 3 = 92.333 (8) Y values per group as a fraction of 249 samples ECONOMICS: 𝑦 = 92.33 CONVENIENCE: 𝑦 = COMFORT: 𝑦 = SECURITY: 𝑦 = SECURITY: 𝑦 = = 43.4 2.13 109 115.25 2.13 106.5 2.13 = 54.10 = 50 2.13 109.375 2.13 = 51.2 = 50.4 RANK CORRELATION COEFFICIENT 𝑟𝑠 = 1 − 2 6 ∑𝑛 𝑖=1 𝑑𝑖 𝑛(𝑛2 − 1) (9) Table 3. Rank 1 PASSENER PREFERENCE TWD (X1) ECONOMICS 57 CONVENIENCE 41 COMFORT 25 SECURITY 25 SAFETY 101 𝑟1 = 1 − RANK 2 3 4.5 4.5 1 6[ (−32 )+ (1)2 + (3.5)2 + (0.52 )+(−22 )] 249(2492 − 1) PHYSICAL ATTRIBUTES 43.3 51.2 54.10 50 50.4 RANK 5 2 1 4 3 di -3 1 3.5 0.5 -2 = 0.99 (10) Table 4. Rank 2 PASSENER PREFERENCE TWD (X1) ECONOMICS 25 CONVENIENCE 56 COMFORT 39 SECURITY 80 SAFETY 49 𝑟2 = 1 − 6[ (02 )+ 02 + (3)2 + (−32 )+(02 )] 249(2492 − 1) RANK 5 2 4 1 3 PHYSICAL ATTRIBUTES 43.3 51.2 54.10 50 50.4 RANK 5 2 1 4 3 di 0 0 3 -3 0 = 0.99 (11) Table 5. Rank 3 TWD ECONOMICS CONVENIENCE COMFORT SECURITY SAFETY 𝑟3 = 1 − PASSENER PREFERENCE (X1) 23 38 84 57 47 6[ (02 )+ (2)2 + (0)2 + (−22 )+(02 )] 249(2492 − 1) RANK 5 4 1 2 3 PHYSICAL ATTRIBUTES 43.3 51.2 54.10 50 50.4 RANK 5 2 1 4 3 di 0 2 0 -2 0 = 0.99 (12) Table 6. Rank 4 TWD ECONOMICS CONVENIENCE COMFORT SECURITY SAFETY 𝑟4 = 1 − PASSENER PREFERENCE (X1) 25 73 61 62 27 6[ (02 )+ (−1)2 + (2)2 + (−22 )+(12 )] 249(2492 − 1) RANK 5 1 3 2 4 = 0.99 PHYSICAL ATTRIBUTES 43.3 51.2 54.10 50 50.4 RANK 5 2 1 4 3 di 0 -1 2 -2 1 (13) Table 7. Rank 5 PASSENER PREFERENCE (X1) 117 31 40 22 39 TWD ECONOMICS CONVENIENCE COMFORT SECURITY SAFETY 𝑟5 = 1 − 6[ (−42 )+ (2)2 + (1)2 + (12 )+(02 )] 249(2492 − 1) RANK 1 4 2 5 3 = 0.99 PHYSICAL ATTRIBUTES 43.3 51.2 54.10 50 50.4 RANK 5 2 1 4 3 di -4 2 1 1 0 (14) The results from the computation shows how correlated the relationship of external factors and passenger preference were from each other wherein as the ranking coefficient approaches to 1 the higher the degree of correlation of the two thus as it approaches 0 the degree of correlation decreases its relationship from each other while from our data the degree of correlation is 0.99 in almost all cases meaning that each passengers preference is associated with the physical factors they experienced. In relationship of real condition once a passenger experiences an availability of physical factors it increases their preference for example a passenger experiences a fast travel time its comfort level also increases while if the passenger rides a coach of full passenger he or she cannot experience seat comfort and spacing among passenger is very close to each other the passenger feels discomfort which affects his or her travel regardless of the travel time. This is the time where the passenger sacrifices his or her preference just to experience a fast travel despite of discomfort and also risking his or her safety. 5. CONCLUSION This research aims to identify the Determinants of travel-with-dignity among the passengers of Metro Rail Transit 3. Through the series of survey, interviews and interpretation of data, the researchers conclude the following. MRT-3 is a railway system that traverses Epifanio Delos Santos Avenue, and is a very essential mode of public transportation to the majority of Filipinos in Metro Manila. Because of its economical aspect, and fast travel time many Filipinos consider this mode of transportation. The MRT-3 is designed to have a capacity of 360000 to 380000 passengers per day but currently their estimated daily ridership is 560000 which exceed their designed capacity. Therefore its level of service, which is the ratio of capacity and volume, is F. Each of the passengers of MRT-3 has different perception on what one should experience or feel when riding the MRT-3 in order to have a dignified travel. Because of this, the researchers collated the feedback of the passengers in order to produce a set of standards which will be the basis of travel with dignity of a passenger. The survey reveals that to define operationally travel with dignity it pertains to travel that encompasses safety features, security, comfort level, fast and cleanliness of the train. After computing the Ranking Correlation Coefficient, it was identified that the personal perception of a passenger's perception in order to experience travel with dignity is related to the physical attributes of the MRT-3. The physical attributes that the majority of the passengers consider are the following: seat comfort on train, comfort and convenience at platform, travel time, convenience from trip origin and convenience to trip destination and these are the majority of passengers’ physical factors choice to consider travel with dignity to increase safety, security, comfort, convenience, and economics. This should be the notion of the mass when they are to utilize the railway transport system. Where the perception of the individual rider of MRT-3 where correlated to produce set of standards for the general passenger and Travel – with – Dignity is what they were supposed to experience once a passenger uses the MRT-3. Travel – with – Dignity is operationally define as travelling of passengers with the attributes of safety, security, comfort, fast, cleanliness of the train, affordable, convenient, efficient, effective, and, economical. With the failure to meet of one or more attributes travel – with – dignity the travel of the passenger is not dignified wherein a passenger sacrifices an attribute for the sake of reaching his or her destination in a short period of time. 6. RECOMMENDATION Based on the result and conclusion of the study, the researchers would like to recommend on the following improvements and developments of MRT-3 for examination and future studies of its service. a. The physical improvement of passenger facilities specifically on waiting areas and passenger concourse. b. The stringer control of passengers' movement in each station that will promote orderliness. c. The addition of trains and the dispatch frequency of the latter to address the bulk number during peak hours. d. Additional personnel in the control of passengers. e. Unequal exploration or the relationship of increasing the fare of MRT-3 and the improvement of service. f. To have an extensive study on disaggregating perception of the respondents on travel - with - dignity. g. The researchers also recommend to establish a concrete definition of travel - with- dignity in all mode of transportation. 6. REFERENCES Gleave, S. D., (2000). Rail Passenger Quality of Service Valuation, London. Fu, L. and Xin, Y., (2007). A New Performance Index for Evaluating Transit Quality if Service, Journal of public transportation, Vol. 10. Lind, D. A. and Meson, R. D., (1994). Basic Statistics for Business and Economics, Boston, Irwin. Prasertsubpakij, D. and Nitivattananon, L., (2012). Evaluating accessibility to Bangkok Metro Systems using multi-dimensional criteria across user groups, Thailand. Choocharukul, K. and Sriroongvikrai, K., (2013). Multivariate Analysis of Customer Satisfaction: A Case Study of Bangkok's Mass Rapid Transit (MRT) Passengers, Thailand. Litman, T., (2008). Build for Comfort, Not Just Speed, Canada. Nathanail, E., (2007). Measuring the quality of service for passengers on the Hellenic railways, Greece. Creative Research Systems, (2012). Sample Size. Retrieved from http://www.surveysystem.com Ye, K., Myers, S., Myers, R., and Walpole, R., (2005). Probability & Statistics for Engineers & Scientists, New Jersey.
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