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Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations

Report
This report is an archived publication and may contain dated technical, contact, and link information
Publication Number: FHWA-HRT-04-145
Date: December 2005

Enhanced Night Visibility Series, Volume XIV: Phase III—Study 2: Comparison of Near Infrared, Far Infrared, and Halogen Headlamps on Object Detection in Nighttime Rain

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APPENDIX F—ANOVA TABLES FOR POST-DRIVE QUESTIONNAIRE



Table 42. ANOVA summary table for the Likert-type scale on detection.
Statement 1: Detection
Source DF SS MS F value P value  
Between
Age 2 1.4 0.7 0.3 0.7487  
Subject/Age 12 29.0 2.4     
 
Within
VES 3 17.9 6.0 7.63 0.0004 *
VES by Age 6 5.4 0.9 1.14 0.3585  
VES by Subject/Age 36 28.2 0.8     
TOTAL 59 81.9       

  * p < 0.05 (significant)

 

Table 43. ANOVA summary table for the Likert-type scale on recognition.
Statement 2: Recognition
Source DF SS MS F value P value  
TOTAL 59 82.7       
Between
Age 2 1.7 0.9 0.42 0.6636  
Subject/Age 12 24.5 2.0     
 
Within
VES 3 19.0 6.3 7.06 0.0008 *
VES by Age 6 5.2 0.9 0.97 0.4619  
VES by Subject/Age 36 32.3 0.9     

  * p < 0.05 (significant)

 

Table 44. 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 59 135.7       
Between
Age 2 35.8 17.9 3.95 0.048 *
Subject/Age 12 54.4 4.5     
 
Within
VES 3 6.3 2.1 2.11 0.1158  
VES by Age 6 3.6 0.6 0.61 0.7188  
VES by Subject/Age 36 35.6 1.0     

  * p < 0.05 (significant)

 

Table 45. ANOVA summary table for the Likert-type scale on roadway direction.
Statement 4: Roadway direction
Source DF SS MS F value P value  
TOTAL 59 114.6       
Between
Age 2 30.8 15.4 5.29 0.0226 *
Subject/Age 12 35.0 2.9     
 
Within
VES 3 6.3 2.1 2.01 0.1306  
VES by Age 6 4.6 0.8 0.74 0.6244  
VES by Subject/Age 36 37.8 1.1     

  * p < 0.05 (significant)

 

Table 46. ANOVA summary table for the Likert-type scale on visual discomfort.
Statement 5: Visual discomfort
Source DF SS MS F value P value  
TOTAL 59 163.7       
Between
Age 2 3.6 1.8 0.21 0.8126  
Subject/Age 12 102.3 8.5     
 
Within
VES 3 9.5 3.2 2.91 0.0479 *
VES by Age 6 8.9 1.5 1.36 0.2555  
VES by Subject/Age 36 39.3 1.1     

  * p < 0.05 (significant)

 

Table 47. 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 59 140.9       
Between
Age 2 3.7 1.9 0.28 0.7598  
Subject/Age 12 79.7 6.6     
 
Within
VES 3 6.9 2.3 1.75 0.1739  
VES by Age 6 3.1 0.5 0.39 0.8822  
VES by Subject/Age 36 47.5 1.3     

 

Table 48. 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 59 151.7       
Between
Age 2 6.6 3.3 0.47 0.6374  
Subject/Age 12 85.1 7.1     
 
Within
VES 3 8.9 3.0 2.29 0.0953  
VES by Age 6 4.2 0.7 0.53 0.7795  
VES by Subject/Age 36 46.9 1.3     

 

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