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Publication Number: FHWA-RD-96-143
Date: April 1997

Development of Human Factors Guidelines for Advanced Traveler Information Systems and Commercial Vehicle Operations: Definition and Prioritization of Research Studies

 

APPENDIX E: EXPERIMENT 2 RESULTS

 

SUBECTIVE RATING FIGURES

ANOVA TABLES

 

SUBJECTIVE RATINGS FIGURES

Mean rated trust for five links traversed.

 

Mean rated trust for six links traversed.

 

Mean rated trust for seven links traversed.

 

Mean rated trust for eight links traversed.

 

Mean rated trust, two middle links averaged.

 

Mean rated trust, three middle links averaged.

 

Mean rated trust, four middle links averaged.

 

Mean rated trust comparing accuracy of purchased information for links traversed.

 

Mean rated self-confidence for five links traversed.

 

Mean rated self-confidence for six links traversed.

 

Mean rated self-confidence for seven links traversed.

 

Mean rated self-confidence for eight links traversed.

 

Mean rated traffic expectations across links with accurate or inaccurate information (Sequence 1).

 

Mean rated traffic expectations across links with accurate or inaccurate information (Sequence 2).

 

Mean rated traffic expectations across links with accurate or inaccurate information (Sequence 3).

 

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ANOVA TABLES

 

Table 97. Analysis of variance for information cost.

independent variable df MS F p
Age 1 0.61 1.41 0.242
S(Age) 46 0.43    
Accuracy 1 0.07 0.41 0.523
Age X Accuracy 1 0.01 0.05 0.831
Accuracy X S(Age) 46 0.16    
Repetition 1 0.35 3.1 0.085
Age X Repetition 1 0.13 1.15 0.289
Repetition X S(Age) 46 0.11    
Accuracy X Repetition 1 0.78 9.65 0.003
Age X Accuracy X Repetition 1 0.08 0.94 0.338
Accuracy X Repetition X S(Age) 46 0.08    

 

Table 98. Analysis of variance for penalty cost.

independent variable df MS F p
Age 1 44.68 4.53 0.039
S(Age) 46 9.86    
Accuracy 1 294.87 32.42 < 0.001
Age X Accuracy 1 96.02 10.56 0.002
Accuracy X S(Age) 46 9.10    
Repetition 1 15.97 1.51 0.225
Age X Repetition 1 21.08 2.0 0.164
Repetition X S(Age) 46 10.56    
Accuracy X Repetition 1 68.57 5.03 0.03
Age X Accuracy X Repetition 1 12.95 0.95 0.335
Accuracy X Repetition X S(Age) 46 13.63    

 

Table 99. Analysis of variance for convergence.

independent variable df MS F p
Age 1 542.04 0.59 0.445
S(Age) 46 914.28    
Accuracy 1 16608.31 11.93 0.001
Age X Accuracy 1 11.46 0.01 0.928
Accuracy X S(Age) 46 1392.69    
Repetition 1 241.79 0.21 0.650
Age X Repetition 1 709.33 0.61 0.438
Repetition X S(Age) 46 1157.40    
Accuracy X Repetition 1 1885.26 2.55 0.117
Age X Accuracy X Repetition 1 547.63 0.74 0.394
Accuracy X Repetition X S(Age) 46 738.32    

 

Table 100. Analysis of variance for trust in the route guidance system.

independent variable df MS F p
Age 1 1631.30 0.69 0.409
S(Age) 46 2350.03    
Accuracy 1 613.20 1.73 0.195
Age X Accuracy 1 390.47 1.10 0.300
Accuracy X S(Age) 46 354.84    
Repetition 1 938.95 6.21 0.016
Age X Repetition 1 382.01 2.53 0.119
Repetition X S(Age) 46 151.14    
Link Position 4 316.96 4.00 0.004
Age X Link Position 4 58.01 0.73 0.571
Link Position X S(Age) 184 79.20    
Accuracy X Repetition 1 2859.76 22.51 < 0.001
Age X Accuracy X Repetition 1 25.11 0.20 0.659
Accuracy X Repetition X S(Age) 46 127.03    
Accuracy X Link Position 4 1378.82 16.12 < 0.001
Age X Accuracy X Link Position 4 22.91 0.27 0.898
Accuracy X Link Position X S(Age) 184 85.52    
Repetition X Link Position 4 71.10 0.92 0.452
Age X Repetition X Link Position 4 49.12 0.64 0.637
Repetition X Link Position X S(Age) 184 77.10    
Accuracy X Repetition X Link Position 4 364.45 6.11 < 0.001
Age X Accuracy X Repetition X Link Position 4 70.81 1.19 0.318
Accuracy X Repetition X Link Position X S(Age) 184 59.65    

 

Table 101. Analysis of variance for trust in the route guidance system:
Purchased link information.

source of variation df MS F p
Linkpurc 1 65.021 0.263 0.608
Age 1 1267.701 5.125 0.024
Linkpurc X Age 1 2228.529 9.009 0.003
Residual 1260 247.380    
Total 1263 249.606    

 

Table 102. Analysis of variance for trust in the route guidance system:
Information type.

source of variation df MS F p
Age 1 335.653 1.292 0.256
Type 3 9514.599 36.619 0.000
Age X Type 3 203.231 0.782 0.504
Residual 624 259.825    
Total 631 303.454    

 

Table 103. Analysis of variance for self-confidence: Purchased link information.

source of variation df MS F p
Linkpurc 1 509.189 1.443 0.230
Age 1 3993.028 11.314 0.001
Linkpurc X Age 1 9093.660 25.767 0.000
Residual 1260 352.914    
Total 1263 362.871    

 

Table 104. Analysis of variance for self-confidence: Information type.

source of variation df MS F p
Age 1 2854.894 8.131 0.004
Type 3 1501.729 4.277 0.005
Age X Type 3 700.298 1.995 0.114
Residual 624 351.103    
Total 631 362.160    

 

Table 105. Analysis of variance for traffic expectations: 
Purchased link information.

source of variation df MS F p
Linkpurc 1 956.198 2.646 0.104
Age 1 5402.856 14.950 0.000
Linkpurc X Age 1 5963.995 16.503 0.000
Residual 1260 361.394    
Total 1263 370.246    

 

Table 106. Analysis of variance for traffic expectations: Information type.

source of variation df MS F p
Age 1 1908.180 5.872 0.016
Type 3 14436.522 44.422 0.000
Age X Type 3 1140.610 3.510 0.015
Residual 624 324.985    
Total 631 397.857    

 

Table 107. Analysis of variance for trust minus self–confidence:  Purchased link information.

source of variation df MS F p
Linkpurc 1 210.298 0.588 0.443
Age 1 9760.491 27.291 0.000
Linkpurc X Age 1 2318.748 6.483 0.011
Residual 1260 357.648    
Total 1263 366.560    

 

Table 108. Analysis of variance for trust minus self-confidence: Information type.

source of variation df MS F p
Age 1 5148.357 12.703 0.000
Type 3 4944.875 12.201 0.000
Age X Type 3 243.330 0.600 0.615
Residual 624 405.299    
Total 631 432.619    

 

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FHWA-RD-96-143

 

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