Documents / Analysis

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

United States Air Force, Air Technical Intelligence Center · 1955-05-05 · 309 pages · text from the file's own layer

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.

  • p. 117 …a? 7T fit at> to 0,1 oti 4P 4t 0.0 7.7 Total 77…
Evaluinon
0-Balloon
1-A.strenomial
12-Airaatt
3-Li|M Ptimom.
4-Bnite
S-Clouds. Dust, t i c
(.traffic, Wo.
7-Piyd»ki|ial
l l M M M t
MOW
Total
JZl VL/ A £> r
Number
Cettan
/
C
0
c
0
c
t-
/ /
Doubtful
t
0
0
0
c
0
c>
4
ToUl
/
/
0
0
0
0
Q
A
7
7-
IS
Per Coil
Ctrt»n
* . 7
26.1
O.Q
0.1
o.o
0.0
oo
' 3 . 3
fi-i
OouMful ToUl
0.0
1C1
0.0
00
o.o
no
o
£>
C
0
o
/
11
Total
/ 5
1 (.
2t
3
0
\
c
0
It
8
ft
Per Cent
Certain
I2A
13. C
I t
O.Q
7 3
LSI
0.0
/S.I
JA
78. H
Doubtful
f-s
2 3
Hi
oo
0 0
0 0
CO
0.0
0. 0
1-1
11.0
Total
/ 7.0
181
27.2
i t
0.0
23
OS
O.O
/S.f
1-1
IM.
Number
Certain
2l
-JJL
XI
1
0
_JL
rt
« •
M>
s
as
Doubtful
/f
17
IX
t?
0
0
P
1
36
Total
21
H 1
3«J
/
0
0
if
26
6
/(I
Percent
Certain
n.o
111
o.c
O.Q
Ml
2.?
a.)
3-/
77t
Doubtful
3.7
/Q.C
1-5
O.f
Q.d
Q.0
O-O
0-0
0,0
Q.i
?2V
Total
25.5
73.6
.!,
0-P
O.f
II-7
3-5
U.I
3.1
lit.
Nunber
:ertain
60
a
_JL
1
J&.
__2L
/&
JL
Doubtful
U-7
3/?
7?
Jf-
1
1
(?
0
1
ToUl
121
110
no
u
•H
X
08
I*
PI
n
PerCent
Certain
n-i
n.i
LJLR
0.5
0.2
10-t
IM
I8.B
1TL
75.1
Doubtful
1-7
H.C
II-1
Q.(,
Q.-7
0-1
• 9 - 1
0.8
0-9
0.1
Vt.7
Total
11 H
/?.3
M-I
IM
01
Q-H
I9.lt
ne
if
no.
/}v 6UST
NUBbH
Certain
-Ik
u/
£
p
3Z-
_ X
/ /
Doutitfu
.??
ZS
34
t,
1
P
1
1/0
Total
75"
ic
75
/ '
0
1
11
(,1
Percent
Certain
It 3
ll.l
II.1
l-t
JLL
UL
1.1
2-3
H.l
%t
~m
Doubtful
11.7
7-2
1.1
l l
O.O
0-3
0.0
O.-i
Q.O
I I
3l. 5
Total
2/r
18-1
Z / f
3 1
0.0
o-i
1-7L
2 0
If-2
3-1
190.
Evaluation
0-Balloon
1-A jtjonoMcal
2-Airoaft
3-Li*l PIMM.
«-Binb
WUwos, Dot. etc
C-kanffic Mo.
T-Pjjdolofcal
I-IMOOM
Mtnei
Total
Sft? T£~S-t Ff/?
Ikaber
Certain
^
3-J~
_ 1
/
/
•/?
17-
I
33
6
Doubtfu
/ /
3/
X
jZ.
/
0
2
ToUl
15
3/
3
3
/
33
a
tH7
Percent
Certain
2-1
iS.O
Lt
Sjj
OJL
0.0
£? 1
(f - 8-l
11
?•/
Q.Q
0.0
6.2
oo
2 If
4.2
Doubtful
H.I
IHC
72-1
Q.O
O.Q
0-0
0 0
0.0
o.O
0 0
41-1
Total
HI
n,75.0
7 /
0-0
0-0
6-2
Q.O
17f
U-2
0.
f 122

Cases discussed

About this file

Analysis, from the classic collection. The PDF is mirrored here; the original link is under it. 309 pages are in the text index: search them above, or from the library's search.