# AN ILLUSTRATION OF COMPARATIVE QUANTITATIVE RESULTS USING ALTERNATIVE ANALYTICAL TECHNIQUES

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1 CHAPTER 8. AN ILLUSTRATION OF COMPARATIVE QUANTITATIVE RESULTS USING ALTERNATIVE ANALYTICAL TECHNIQUES Based on TCRP B-11 Field Test Results CTA CHICAGO, ILLINOIS RED LINE SERVICE: 8A. CTA Red Line - Computation of Impact Scores For each transit site, impact scores are calculated from the survey data results, and are as displayed as shown in Tables 8.1 and 8.2 (CTA Red Line), Tables 8.5 and 8.6 (CTA Blue Line), Tables 8.9 and 8.10 (Combined CTA Rail) Tables 8.15 and 8.16 (Sun Tran, Albuquerque), and Tables 8.22 and 8.23 (GLTC, Lynchburg, VA). First, data for whether or not a customer has experienced a problem with each attribute is cross-tabulated with mean overall satisfaction. Thus, for example as shown in Table 8.1, the mean overall satisfaction of those CTA Red Line customers (sample size=300) who have experienced a problem with "trains being overcrowded" within the last 30 days is 6.102; while the mean overall satisfaction of those customers who have not experienced a problem with trains being overcrowded is The gap score is the difference between the two means (1.176). The percent of Red Line customers who have experienced a problem with trains being overcrowded within the last 30 days, is 75.3%, as shown in Table 8.2. To combine the effects of these two results we multiply the gap score (1.18) by the problem occurrence rate (.753) to arrive at an overall impact score of for the attribute. Impact scores for each attribute are then placed in descending order (Table 8.1), and the results are a display of the most problematic service attributes, from top to bottom. The logical assumption is that reducing the percent of customers who have a negative experience with the impact or driver attributes will have the greatest possible upward effect on overall satisfaction with the transit system. However, Table 8.2 shows a more complete picture from the data. The darkly shaded cells show the attributes that are above the median rank for each category. The ranking columns (with ranks of 1 to 10 for importance, 1 to 8 for satisfaction, 1 to 12 for problem occurrence, and 1 to 7 for the overall satisfaction gap value) show the statistically significant placement of each attribute for the measure indicated. These statistical rankings are based on the appropriate t-test, chi-square test, or z-test for proportions. Incorporating this information, we can say that the service attribute of "trains being overcrowded" is of only medium importance to customers (4 th in ranking), while satisfaction with the attribute is very low (8th). This disparity is reflected in the impact score calculation for the overall satisfaction gap value (1.176 or 1.2). This value ranks the attribute as only 3 rd in its impact on overall satisfaction with service. However, the attribute's reported problem occurrence rate (73.5% of customers) ranks it 1 st in this category. On the impact score placement scale, taking into account both the overall satisfaction gap value and rank and the problem occurrence value and rank, this attribute ranks first as the attribute whose improvement would have the greatest positive impact on overall satisfaction with CTA Red Line service. Measuring Customer Satisfaction and Service Quality 33

2 The top target area attributes for the CTA Red Line as determined by the impact score approach are as shown below: CTA Red Line Service Target Attributes (N=300) 8B. CTA Red Line Comparison with Quadrant Analysis As shown in Tables 8.1 and 8.2, when impact score results for the CTA Red Line are compared with Quadrant Analysis results as shown in Chart 8.3, some significant differences appear. The Quadrant Analysis is based upon mean stated attribute rating for importance and satisfaction. An alternative Gap Analysis would derive importance ratings from correlations of attribute satisfaction ratings with overall satisfaction ratings, as described in section 7D. For the quadrant analysis, it should first be noted that (given the sample size of 300), if the appropriate tests of statistical significance are applied (at the 90% confidence level), many of the service attributes have the exact same positioning on the quadrant analysis chart. Thus, the service attributes of explanations of delays and cleanliness of interiors share the same positioning (1). The positioning is a rank of "3" in importance and a rank of "6" in satisfaction. Likewise, the attributes of physical condition of stations and fairness/consistency of fare share the same positioning on a quadrant analysis chart as indicated (2). These attributes are both ranked "4" in importance and "5" in satisfaction. Ordering service attributes by their quadrant analysis placement becomes a function of statistical significance, influenced highly by completed sample sizes. Moreover, as previously discussed, importance ratings for attributes, gap analysis of the relationship between attribute satisfaction ratings and overall satisfaction, and gap values as computed for impact scores are likely to remain constant over time. The order of importance of attributes alone, or as calculated by relationship with overall satisfaction, is a structural one not likely to change much when remeasured in future years. Thus, tracking of customer satisfaction, using quadrant analysis or gap analysis, depends mostly on changes in stated satisfaction ratings for attributes, and the differences in these ratings over time is likely to be statistically insignificant for many attributes particularly if satisfaction with service is generally high. Measuring Customer Satisfaction and Service Quality 34

4 Table 8.1 Computation of Impact Scores - Red Line (N=300) Measuring Customer Satisfaction and Service Quality 36

5 Table 8.2 Summary of Rankings and Scores - CTA Red Line ( ) Numbers indicate statistically significant rank at the 90% confidence interval level * Split sample size=100 Shaded cells are above median Measuring Customer Satisfaction and Service Quality 37

6 Chart 8.3 Quadrant Analysis of Performance (Satisfaction) vs. Importance for CTA Red Line Service The intersection of the axis is the median rank value on importance (from left to right) and satisfaction (from bottom to top) (N=300) NOTE: Please refer to the numbered list of attributes in Table 8.1 and 8.2 for descriptions of the attributes shown as numbers in the above chart. The "target area" consists of the attributes that riders consider very important, but are rated low on satisfaction. The following attributes fell into the "target area" for the CTA Red Line: Trains that are not overcrowded Reliable trains that come on schedule Explanations and announcements of delays Frequent service so that wait times are short Cleanliness of the train interior Temperature on the train Fairness/consistency of fare structure Frequency of delays for repairs/emergencies Cleanliness of stations Physical condition of stations Measuring Customer Satisfaction and Service Quality 38

7 8D. CTA Red Line Comparison with Factor Analysis A factor analysis was performed on the 30 attributes not included in split sampling (all respondents were asked to rate each of these questions). It should be noted, utilizing the impact score approach, only one attribute that appears in the target area was a part of split sampling treatment: "cost effectiveness, affordability, and value". However, five of split sample attributes placed within the second tier for impact score rankings. Split sampling of 18 attributes (including "having a station near my home" and "having a station near my destination") was used in the TCRP B-11 project to reduce the length of the phone interview. Each respondent was asked to rate the same 30 attributes, the remaining 18 attributes where rated by only a third of the sample (100 respondents for the Red Line), with each third being asked to rate a different 6 attributes. Split sampling cannot be effectively used when factor analysis is employed. For factor analysis to be reliable without very large sample sizes, all respondents must be asked all questions. Therefore, this factor analysis comparison is based on comparison analysis of the 30 attributes asked of all CTA Red Line customers. The correlation results for the factor solution are displayed in Table 8.4. Four dimensions were found which are labeled: "trip performance", "personal security", "customer service", and "comfort". The communality correlations for the attributes within each dimension are as shown for each attribute. Table 8.4 Factor Dimensions for CTA Red Line Service * values greater than 0.5 significance (N=300) Measuring Customer Satisfaction and Service Quality 39

8 None of the intercorrelations among attributes is above the 0.8 level that would be considered highly correlated. All except one correlation are within the medium range of 0.4 to 0.8. The factor analysis does little to help us differentiate among the many "trip performance" attributes as to what should be targeted for agency action. It is clear Red Line customers equate cleanliness of the trains and stations with a sense of personal security and safety; however, the travel environment attributes important to Red Line customers were more specifically identified by the impact score analysis. Shelters and benches could be as easily correlated with the "comfort" dimension as with "customer service". When multiple regression analysis is performed to identify the dimensions' order in terms of the strength of their relationship with overall satisfaction with Red Line service, the order is as follows: 1. Trip performance 2. Comfort 3. Customer service 4. Personal security By contrast the impact score analysis found the target area attributes for Red Line Service to be a combination of specific attributes within the trip performance, comfort, and personal security dimensions. "Not overcrowded", "temperature on trains", smoothness of ride", "absence of odors", and "clean train interiors" all have higher correlations with (or impacts on) overall satisfaction than "route/direction information on trains", "connecting bus service", or "frequency of service on Saturdays/Sundays" all attributes placed within the first ordered dimension. A factor analysis alone would be unlikely to target important and specific trip environment characteristics which cross factor defined dimension boundaries. Measuring Customer Satisfaction and Service Quality 40

9 CTA BLUE LINE SERVICE 8E. CTA Blue Line - Computation of Impact Scores The top target area attributes for the CTA Blue Line as determined by the impact score approach are as shown below: CTA Blue Line Service Target Attributes (N=302) Thus, for Blue Line service, customer-defined requirements are more travel performance oriented than for Red Line service in Chicago. Also, the physical condition of vehicles and infrastructure is more likely to have an impact on overall satisfaction for Blue Line riders. Red Line service customers are more concerned with such travel environment elements as: Cleanliness of the train interior Temperature on the train Absence of offensive odors Freedom from the nuisance behaviors of others The attributes above have slightly lower reported problem occurrence rates on the Blue Line, and also have less impact on Blue Line customers' overall satisfaction. 8F. CTA Blue Line Comparison with Quadrant Analysis When impact score results for the CTA Blue Line, as shown in Table 8.5 and Table 8.6, are compared with Quadrant Analysis results as shown in Chart 8.7, significant differences appear. Measuring Customer Satisfaction and Service Quality 41

11 Table 8.5 Computation of Impact Scores Blue Line (N=302) Attribute Measuring Customer Satisfaction and Service Quality 43

12 Table 8.6 Summary of Rankings and Scores - CTA Blue Line ( ) Numbers indicate statistically significant rank at the 90% confidence interval level * Split sample size=100 Shaded cells are above median Measuring Customer Satisfaction and Service Quality 44

13 Chart 8.7 Quadrant Analysis of Performance (Satisfaction) vs. Importance for CTA Blue Line Service The intersection of the axis is the median rank value on importance (from left to right) and satisfaction (from bottom to top) (N=302) NOTE: Please refer to the numbered list of attributes in Table 8.5 and 8.6 for descriptions of the attributes shown as numbers in the above chart. The "target area" consists of the attributes that riders consider very important, but are rated low on satisfaction. The following attributes fell into the "target area" for the CTA Blue Line: Reliable trains that come on schedule Frequent service so that wait times are short Frequency of delays for repairs/emergencies Explanations and announcement of delays Fairness/consistency of fare structure Cleanliness of stations Absence of offensive odors Cleanliness of the train interior Freedom from the nuisance behaviors of others Measuring Customer Satisfaction and Service Quality 45

14 8H. CTA Blue Line Comparison with Factor Analysis A factor analysis was performed for the 30 attributes not included in split sampling (all respondents were asked to rate each of these questions). The CTA Blue Line correlation results for the factor solution are displayed in Table 8.8 below. Five dimensions were found which are labeled: "personal security", "trip performance", "communications", "customer/agency interaction", and "transfer service". The communality correlations for the attributes within each dimension are as shown for each attribute. Table 8.8 Factor Dimensions for CTA Blue Line Service * values greater than 0.5 significance (N=302) None of the intercorrelations among attributes is above the 0.8 level that would be considered highly correlated. All except one correlation are within the medium range of 0.4 to 0.8. The factor analysis for Blue Line service attributes is less differentiated than for the Red Line. Multicolinearity among attributes is extensive. The factor analysis obtained significant values for only two-thirds of the 30 attributes tested. For example, the temperature on the train is closely correlated with the dimension of trip performance but also with perceptions of customer/agency interactions. On the basis of multiple regression analysis using the dimensions as the independent variables, the order of the dimensions in terms of their affect on overall satisfaction is as follows: 1. Trip performance 2. Customer/agency interactions 3. Communications 4. Transfer service 5. Personal security Measuring Customer Satisfaction and Service Quality 46

15 Three of the attributes identified by the impact score approach as within the top tier for target issues are not within the top factor analysis dimension because they were not highly correlated with other trip performance attributes. These attributes are: explanations/announcements of delays, friendly/courteous/ quick personnel, and smoothness of the ride and stop. All of these attributes are placed by the factor analysis in a secondary dimension tier that we have labeled "customer/agency interactions". Measuring Customer Satisfaction and Service Quality 47

16 COMBINED CTA RAIL 8I. Combined CTA Rail - Computation of Impact Scores The top target attributes for combined CTA rail customers, determined from weighted data as defined in Appendix D, and determined by the impact score approach are as shown below: Combined CTA Rail Target Attributes (N=602) The target issues or attributes are a combination of travel performance and travel environment issues. As previously noted, Blue Line customers are more concerned with the former. (See Tables 8.9 and 8.10 for impact scores). It should also be noted that for the top attribute of concern, "trains that are not overcrowded", almost three-fourths (72%) of CTA customers report that they have had a problem with this within the last 30 days. Also, satisfaction with this attribute was the lowest for all attributes. However, perhaps due to the fact that such a high percentage of customers experience this problem, negative experience does not show a high impact on overall satisfaction, and the attribute ranks only in the median range for importance. Thus, while this attribute should be tracked, it is possible that reducing the percent of customers experiencing a problem with overcrowding will not have a significant effect on improving overall satisfaction. The impact score analysis shows both Red Line and Blue Line customers to be price sensitive. The "cost and value" attribute should also be carefully tracked. Experiencing problems with this attribute has a significant impact on overall satisfaction with service; a rise in the percent of customers reporting a problem with cost or value could significantly lower overall customer satisfaction levels. Almost half of CTA customers report experiencing a problem with four travel environment issues: Cleanliness of the train interior Temperature on the train Smoothness of the ride and stops Absence of offensive odors Measuring Customer Satisfaction and Service Quality 48

17 The first two have significant effects on overall customer satisfaction with service; the latter two, smoothness of the ride and stops and absence of offensive odors, have an impact on overall satisfaction that is just below the median for all attributes. Frequency of service on Saturdays and Sundays, accessibility of trains to those with a disability, and absence of graffiti have high dissatisfaction ratings; however, these attributes are shown by the impact score approach to have low or moderate problem occurrence rates and affects on overall satisfaction. CTA generally gets high marks on: Number of transfer points Safety from crime on trains and at stations Physical condition of vehicles and infrastructure Availability of information by phone and mail Traveling at a safe speed 8J. Combined CTA Rail Comparison with Quadrant Analysis When impact score results for the combined CTA Rail customers are compared with Quadrant Analysis results as shown in Chart 8.11, significant differences appear. The quadrant analysis does not take into account the relatively low problem incidence rate for "fairness and consistency of fares" and "cost effectiveness, affordability, and value", coupled with the very high affect of "cost and value" on overall satisfaction. The quadrant analysis includes "fairness and consistency of fares" in the target issues but excludes "cost and value". The quadrant analysis includes "freedom from the nuisance behaviors of others"; however, this attribute is reported as a problem by only 26% of customers and has an impact on overall satisfaction that is below the median for all attributes. Conversely, "availability of seating, "trains that are not overcrowded", and "smoothness of ride" are excluded from the target area in a quadrant analysis, ignoring their high reported problem incidence rates, coupled with moderate to high impacts on overall satisfaction. Due to weighting complications and the unreliability of factor solutions for the CTA Blue Line (extensive multicolinearity among attributes), the factor analysis for combined CTA Rail customer ratings did not yield meaningful or reliable results. Measuring Customer Satisfaction and Service Quality 49

18 Table 8.9 Computation of Impact Scores Comb. CTA (N=602) Attribute Measuring Customer Satisfaction and Service Quality 50

19 Table 8.10 Summary of Rankings and Scores - Combined CTA Rail ( ) Numbers indicate statistically significant rank at the 90% confidence interval level * Split sample size=100 Shaded cells are above median Measuring Customer Satisfaction and Service Quality 51

20 Chart 8.11 Quadrant Analysis of Performance (Satisfaction) vs. Importance for Combined CTA Rail Service The intersection of the axis is the median rank value on importance (from left to right) and satisfaction (from bottom to top) (N=602) NOTE: Please refer to the numbered list of attributes in Tables 8.9 and 8.10 for descriptions of the attributes shown as numbers in the above chart. The "target area" consists of the attributes that riders consider very important, but are rated low on satisfaction. The following attributes fell into the "target area" for combined CTA Rail: Reliable trains that come on schedule Frequent service so that wait times are short Explanations and announcement of delays Frequency of delays for repairs/emergencies Cleanliness of the train interior Temperature on the train Absence of offensive odors Fairness/consistency of fare structure Freedom from the nuisance behaviors of others Measuring Customer Satisfaction and Service Quality 52

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