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…
i
Evaluation
((•Balloon
1-AstnniMical
2-Airaaft
3-Litht Phenon.
4-Binb
S-Clouds, Dust, etc
6-lnsuflic bik.
7-Psycho lope*
B-Uotaow
SfltJnr
Total
Number
Certain
0
/0
0
_J_
0
0
\ 0
0
0
Doubtful
0
?
(?
0
0
o
o
0
0
/
4-
Total
O
y ?
0
0
0
0
2.
0
0
(
' ( •
Percent
Certain
0,6
0.0
0.0
o.o
&£.
*O
P.O
0.0
ir.o
Doubtful
00
0,0
o.o
0,0
fl.b
P-0
0,0
0.0
6*
zfio
Total
*/,?
e,o
6,0
0,0
Ao
O,0
to
100.
Number
Certain
;
o
c
0
0
0
o
0
J L
Doubtful
0
.o
Ao
Total
p.o
/0O.O
o.o
0-0
6,0
O.D
O.P
0.0
#0
o,o
/lo.
Nunbei
lertain
X
0
0
0
0
f.
0
/
J~
Doubtful
0
fi
0
0
0
0
0
0
0
Total
0
2
0
0
0
6
0
/
-r
?
PnCent
Certain
_^2
jf.P
S.Q
J1&-
0."
\2£X
0.0
/A/
O.o
Doubtlul
O.O
0.0
0,0
0,0
0.0
0,0
to
o,o
a?
ToUl
A»
0,0
ff.p
O.P
?*-*•
/DO,
>J r'/r/t-
Numbet
Certain
3
—0-\
_ £ _
0
1
0
—3-
0
Doubtful
0
f
. 0
0
0
0
(?
p
o
?
ToUl
3
0
I
Q
I
0
S
ft
Percent
Certain
I/-/
JLSA
16-7
JU.
0.P
/£.7
AS
ff.i
Doubtful
CO
buS
C
6.0
on
fl.p
o.o
All
o.O
Tot*
# I I O M
1-Astmrmical
2-Aircraft
1-Lijht Phenoo.
4-Birts
5-Clouds, Dust etc.
6-lrauffic Info.
7-Psycholojical
B-UnknoM
9-otfier
Total
Evaluation
0-Balloon
1-Astronomical
2-Aircraft
3-LijM Pherm.
• - B i r *
5-Clouds, Dust, etc.
6-lnsiffic kib.
7-Psycholojical
S-Untoowi
M i n e r
Total
Certain
0
/_J
1
0
0
0
-J—
0
1
0
6
Certain
0
0
[_
0
_J2-
0
6
I
0
0
/V/ty
Number
Doubtfu
0
1
o
3
r>
/9
r
Nwnber
Doubtfu
/
0
0
0
0
0
0
1
Total
0
2
/
1
0
J
0
1
Q
If
ToUl
3
1
z
Q
• 0
0
0
1
0
1
*
Certain
0,0
7,1
r./
9.0
CO
0-0
9,1
6-P
Certain
0,0
CO
6,0
(6
0.0
6,0
6,0
A0
Percent
Doubtfu
0,6
9.1
0.6
2-7.3
9,1
O.t
*.s
0.0
*O
Percent
Doubtfu
37S
/lS
0,0
00
0.0
0.0
o.o
0.V
/2.S
9ST.0
ToUl
fi.P
/T.2
1/
1,1
0.0
7-7*
o.o
1,1
0.0
100,
ToUl
S7.S
12.3
2SA
0,0
00
(1.9
0.(1
OS
ns
/oo.
Number _j
Certain
3
0
- £ \
0
_e_
0
0
_J2_
O
3
Doubtful
P
0
0
3
0
Q
0
0
gi
J
Total
J
0
0
3
o
0
O
0
o
0
A
Number
Certain
__£
/
__L_
f
0
0
o
Doubtful
f
0
0
1
0
D
0
0
0
/,?
ToUl
/
1
7
(?
f>
0
7-
0
30
Percent
Certain
0.O
0-0
0.O
0.0
0.0
O.o
&O
Doubtful
0.0
0.0
O,Q
S-0.0
O.D
O.D
0,0
0.6
ao
ao
6~o.o
Total
s&.o
OJ
0.0
$6.0
0.0
00
00
0-6
0-0
0,6
100.
f-yf
Per Cent
Certain
/(.7
JL1
y 3
3,3
33
ao
2.0.O
Q.0
(.7
o.o
5^.7
Doubtful
30.0
/o.o
0.0
0 (?
• 3.3
0.0
0-0
O.O
00
0P
Jt-3.3
Total
¥1-7
13.3
?, ?
>,0
•zao
0-0
fy
00
loo
Certain
-JL.
f
1
0
0
0
0
IL
Nunber
Doubtful
/
f
2
0
1
0
0
0
0
13
/Vet.
ToUl
6"
/3
7
/
0
0
0
/ /
/
31
Number
Certain
1
-Jt-
0
O1
0
1
Q
0
lit
Doubtful
r
i
0
6
(I
0
D
0
0
0
6
Total
6
i
0
0
0
J
0
0
/
xo
y
Percent
Certain
//•3
M3.
a±
2,6
-&£
0.6
o.o
!.(,
66,7
Certain
S~,0
3S~,0
36.0
-&l
J2J.
s:o
o.o
O.O
s-.o
70.0
Doubtful
Z.3J
*"/
0.6
OO
o.o
0,0
O.D
t-0
33.3
/r
PerCent
Doubtful
5.0
0.0
CO
0,0
O.o
O.D
0.0
c,o
0.0
3i-o
Tout
IXf
3m
?,l
0,0
CP
0,0
25,2
m.
Tolal
30.0
UtD
ten
DO
0,0
O'O
60
60
1°).
6O>
Number
Certain
— ' - \
0
_JL
1
0
0
n.
Doubtful
2.
/
q>
0
o
o
P
7
P4
ToUl
p.
It
p
P
0
0
-J—
(/
Number
Certain
2
0
J2_
0
J
0
/ $ •
Doubtful
a
9
—J—
0
0
6-
0
0
o 1
/0
Total
X
/ /
0
0
G
3
0
7
I f
s r
Per Cent
Certain
O.O
Ifi. 2
££.
JLO
0.0
±L.
0,0
JJL.
36M
Certain
7.1
0.0
0.0
o.o
0.0
U2J>
3'X.I
7./
6H.3
Doubtful
/•/ 2
/$.2
Oj
0.6
00
0.6
00
O.O
0,0 \
t vr
Per Cut
Doubtful
6.0
IJ.I
3.6
CO
0.0
o.o
ro
fi.C
Cc
3f,7
Total
iLz
193
6JL
D_J
7.1
100
Total
71
3.(
ao
to
t.D
to. 7
0.0
7/
/OO,
in

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.