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

Special Report No. 14 was issued by the U.S. Air Force's Air Technical Intelligence Center on 5 May 1955. It is a statistical study of about 4,000 reports of unidentified aerial objects from June 1947 to December 1952. The reports were reduced to IBM punched cards and analyzed with methods including chi square tests. The report concludes that the reports it examined are very unlikely to represent technology beyond present scientific knowledge, and it notes that no case produced valid physical evidence.

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r
c
o
Ik.
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CL
100
90
80
70
60
50
40
30
20
10
Unknown
_lnsuf. _
- i n f o . ~
Balloon
Aircraft
vAstro-
nomical
White
23.5%
100
90
80
70
60
50
40
30
20
10
c
a>
O
V.
a.
Metallic
17.7%
Not
stated
12.3%
Orange
10.0%
Red
8.1%
Other
2 8 . 4 %
FIGURE II DISTRIBUTION OF OBJECT SIGHTINGS BY REPORTED COLORS
OF OBJECTCS) WITH EVALUATION DISTRIBUTION FOR EACH
COLOR GROUP
f A-7469
27