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.

\
1
1 Equation
'0-Balloon
1-AstnnMial
2-Airetatt
J-Li|M Pfwnon.
4-Birrtain
3
71
0
0
^
/
0
/0
/
39
Doubtful
0
ft
0
0
i-
Numbei
:ert*n
_&_
_&_
/?
\
10.8
0.0
/LI
2.7
76'7
Doubtful
.*•
$-.?
P-0
0.0
0,0
00
r
Nuinber
Certain
/
/
±_
0
0
•0-
/L
/*/
Ooubtful
0
&
0
0
0
0
.0
t?
0
3
Total
/
s
Y
a
0
p
ff
z
/7
Percent
Certain
s o
/7.L
/7L
ao
0.0
D.O
0.0
O.o
3S3
t i t
Doubtful
0.0
tt-S
*•?
on
tf.fi
\ 00
O.o
at?
0.0
0.0
tn
Total
S~-9
HY
Z34
o.o
0.0
0,0
0.0
0-0
5?
/to.
I
Number
Certain
Y
7
0
#
0
/?
r
0
30
Doubtful
/
Y
^
/
0
a
0
0
Total
5
//t
7
I
/?
0
7
0
3i
//A
'?S/
Certain
/ / /
??./
lt-t
fl.O
0,0
0.0
tit
m

0
0
0
0
0
g
Total
2
7
P
0
£_
0
9
S
17
Certain
S.Y
£J-
/0-g
0,0
0.0
/L2.
0.0
2YJ
7g.Y
Per C a l l
Doubtful
I36
f I
0.0
0-0
0.0
0.0
00
(?•/?
0-0
2/. I
Total
2/ /.
/$?
0./)
0.0
/L2.
0.O
£Y3
ft*
/OO.
rfsr 0^ £i-LE:A/r
Number
Certain
/ /
/ 7
0
0
0
7
/0/
Doubtfu
g
_/£_
0
0
0
0
0
3?
Total
-2L
24
?/
2.
0
0
£_
/ / /
Percent
Certain
g.2.
/2.7
/ 5 "
0.0
0./J
3.0
0.0
su.
r.z
Doubtful
//•2
00
0.0>
0.0
0.0
0-0
0.0
Total
/s.7
If'7
2S.I
/•£
00
0-0
3.0
Pfl
ft.t
/GO
' G0O0
Number
Certain
6Z
it
12.
7
20
z
'7'
u.
Y70
Doubtful
4S
7Y
f
—A-
0
0
£_
/79
Total
fjj
(4'
/Yl
I?
7
f.t?
2,
/?/
• f/
Percent
Certain
/a.s
/5-.I
/ • /
0L
0.3
3/
0.3
U.3
4.0
72.4
Doubtful
U
t/.Y
07.
t-t
0-0
0.0
47 l>
Total
'?'/
at
i.i
3 /
01
1LJ
ML-
Nunber
Certain
^£.
7f
92,
3
7Y
fl
Y3t
Doubtful
*6
12,
ft
f
J
a
0
2,
/9U
Total
/ / /
// 0
/go
3
74
uY
PejCent
Certain
1.1
11.3
/Y.S
0.S
0.2.
U.7
2.1
30
/O.0
Doubtful
ft
//•?
0-5-
0-3
00
0-i.
0.0
0.3
3iO
Total
tt*
/7Y
UY
ff
/.*
//•7
'11
33
Number
Certain
3/
3/
0
£/
t.
V3
0
22S
Doubtfu
u
2f
p
2.
a
9
to
Total
72,
0
-ki-
ll
Y3
9
SOS
PetCmt
Certain
/£>./
/$./
At.
0.7
0.0
/9.9
2-0
/Y/
0.0
73. t
Doubtful
<£/
g.s
6.9
0.0
0-3
0.0
0.0
07
2-9
2L2
Total
/7O
t7fi
/•£
/.0
ao
/99
2.7
/Y/
2?
ML-
1 3 3

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.