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Publication Number: FHWA-HRT-04-144
Date: December 2005

Enhanced Night Visibility Series, Volume XIII: Phase III—Study 1: Comparison of Near Infrared, Far Infrared, High Intensity Discharge, and Halogen Headlamps on Object Detection in Nighttime Clear Weather

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APPENDIX G—ANOVA SUMMARY TABLES FOR SUBJECTIVE RATINGS



Table 32. ANOVA summary table for the Likert-type scale on detection.
Statement 1: Detection
Source DF SS MS F value P value  
TOTAL 107 225.2       
Between
Age 2 1.7 0.8 0.23 0.7936  
Subject/Age 15 53.8 3.6     
 
Within
VES 5 59.2 11.8 9.6 <0.0001 *
VES by Age 10 18.0 1.8 1.46 0.1724  
VES by Subject/Age 75 92.5 1.2     


Table 33. ANOVA summary table for the Likert-type scale on recognition.
Statement 2: Recognition
Source DF SS MS F value P value  
TOTAL 107 206.3       
Between
Age 2 0.2 0.1 0.03 0.9677  
Subject/Age 15 54.9 3.7     
 
Within
VES 5 41.7 8.3 6.3 <0.0001 *
VES by Age 10 10.2 1.0 0.77 0.6559  
VES by Subject/Age 75 99.3 1.3     


Table 34. ANOVA summary table for the Likert-type scale on lane-keeping assistance.
Statement 3: Lane-keeping assistance
Source DF SS MS F value P value  
TOTAL 107 259.0       
Between
Age 2 21.7 10.8 1.42 0.2713  
Subject/Age 15 114.1 7.6     
 
Within
VES 5 23.5 4.7 4.14 0.0022 *
VES by Age 10 14.6 1.5 1.29 0.2505  
VES by Subject/Age 75 85.0 1.1     


Table 35. ANOVA summary table for the Likert-type scale on roadway direction.
Statement 4: Roadway direction
Source DF SS MS F value P value  
TOTAL 107 243.7       
Between
Age 2 6.9 3.5 0.68 0.5204  
Subject/Age 15 75.9 5.1     
 
Within
VES 5 37.2 7.4 5.25 0.0003 *
VES by Age 10 17.4 1.7 1.23 0.2862  
VES by Subject/Age 75 106.3 1.4     


Table 36. ANOVA summary table for the Likert-type scale on visual discomfort.
Statement 5: Visual discomfort
Source DF SS MS F value P value  
TOTAL 107 240.3       
Between
Age 2 0.8 0.4 0.05 0.948  
Subject/Age 15 111.4 7.4     
 
Within
VES 5 20.7 4.1 3.12 0.0129 *
VES by Age 10 8.0 0.8 0.6 0.8075  
VES by Subject/Age 75 99.5 1.3     


Table 37. ANOVA summary table for the Likert-type scale on reading signs sooner.
Statement 6: Read signs sooner
Source DF SS MS F value P value  
TOTAL 107 305.4       
Between
Age 2 15.4 7.7 1.54 0.2463  
Subject/Age 15 75.0 5.0     
 
Within
VES 5 66.2 13.2 8.07 <0.0001 *
VES by Age 10 25.8 2.6 1.57 0.131  
VES by Subject/Age 75 123.0 1.6     


Table 38. ANOVA summary table for the Likert-type scale on overall safety rating.
Statement 7. Overall safety rating
Source DF SS MS F value P value  
TOTAL 107 263.5       
Between
Age 2 0.9 0.5 0.06 0.9426  
Subject/Age 15 114.6 7.6     
 
Within
VES 5 22.0 4.4 2.88 0.0197 *
VES by Age 10 11.6 1.2 0.76 0.6627  
VES by Subject/Age 75 114.4 1.5     


Table 39. ANOVA summary table for the Likert-type scale on overall VES evaluation.
Statement 8. Overall VES evaluation (better than regular)
Source DF SS MS F value P value  
TOTAL 106 250.5       
Between
Age 2 1.0 0.5 0.07 0.9299  
Subject/Age 15 104.6 7.0     
 
Within
VES 5 15.0 3.0 1.89 0.1061  
VES by Age 10 12.3 1.2 0.77 0.6532  
VES by Subject/Age 74 117.6 1.6     

 

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