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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       

 

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     

 

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     

 

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     

 

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     

 

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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