Project Blue Book Special Report No. 14: Analysis of Reports of Unidentified Aerial Objects

TABLE OF CONTENTS
Page
SUMMARY • vii
1
INTRODUCTION 1
ORIGIN AND NATURE OF DATA 3
REDUCTION OF DATA TO MECHANIZED COMPUTATION FORM 4
Questionnaire 4
Coding System and Work Sheet 6
Identification of Working Papers 7
Evaluation of Individual Reports - 10
ANALYSIS OF THE DATA 14
Frequency and Percentage Distributions by Characteristics 14
Graphical Presentation 16
Advanced Study of the Data 16
Position of the Sun Relative to the Observer 16
Statistical Chi Square Test . 60
The "Flying Saucer" Model 76
CONCLUSIONS 94
APPENDIX A. TABULATION OF FREQUENCY AND PERCENTAGE
DISTRIBUTIONS BY CHARACTERISTICS . . . . 95
APPENDIX B. WORKING PAPER FORMS 255
LIST OF ILLUSTRATIONS
Figure 1 Frequency of Sightings by Year for Object, Unit, and All Sightings 17
Figure 2 Distribution of Evaluations of Object, Unit, and All Sightings for All Years 18
Figure 3 Distribution of Object Sightings by Evaluation for All Years With Comparisons
of Each Year for Each Evaluation Group 19
Figure 4 Distribution of Object Sightings by Evaluation for All Years and Each Year 20
Figure 5 Distribution of Object Sightings by Evaluation Within Months for All Years 21
Figure 6 Distribution of Object Sightings by Certain and Doubtful Evaluations for
All Years and Each Year 22
Figure 7 Frequency of Object Sightings and Unknown Object Evaluations by
Months, 1947-1952 23
Figure 8 Distribution of Object Sightings by Sighting Reliability Groups With
Evaluation Distributions for Each Group 24
Figure 9 Distribution of Object Sightings Among the Four. Sighting Reliability
Groups for All Years and Each Year 25
Figure 10 Distribution of All Sightings by Sighting Reliability Groups, Segregated
by Military and Civilian Observers, With Evaluation Distribution
for Each Segregation 26
Figure 11 Distribution of Object Sightings by Reported Colors of Object(s) With
Evaluation Distribution for Each Color Group 27
Figure 12 Distribution of Object Sightings by Number of Objects Seen per Sighting.
With Evaluation Distribution for Each Group . . . . . . . 28
Figure 13 Distribution of Object Sightings by Duration of Sighting With Evaluation
Distribution for Each Duration Group . , 29
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