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. 190 …S £'0/? 'S t r/0fl/ Of- roe M0/ur*/i/as EvaMnon 0-BIIIOM l…
J2£- d££- -J&L.
ri;
Evaluation
0-Balloon
: 1-Aslronomical
2-Aircraft
3-lijtit Phenom.
(•Birds
fcClouds, Dust, e c
S-lnsuffic Into.
7-Psycnolo|ical
t-Unknoan
9-Ottie-
{ Total
Number
Certain
/
/?
)
P
P
0
-,
0
f
p
/7
Doubtful
D
%
P
P
o
p
• p
r
p
p
Total
/
*Q
/
o
o
0
7.
P
P
as
Percent
Certain
A>,P
J/f.P
/f.e
O.c
0.(
At
V P
OJ>

S-O
0.O
y-0
P.O
/OO.
&~/0 5E
Percent
Certain
JP.0
JUL
20.C
P.0
0.1
P.O
0.0
o-o
lf-0.0
/0-D
.0
Doubtful
0.0
2-0-0
0-0
0-0
0.0
Ob
ao
0.0
0.0
2-0-0
Total
/0.O
20-0
20.0
0.0
0.0
o.o
o.O
0.0
Ctd-0
' '0.0
/0O,
Evaluation
0-Balloon
]-Astnnofflical
2-AircraN
3-liftit Phenom.
4-Birds
S-Clouds, Dust, etc
6-lnsuftic Into.
7-Psycholojical
HJntawMi
Wither
Total
4/ S^-iv/vr^ — S~-A7/jv0rfs'
Number j
Certain
4-
7
0
P
)
/6
ri
Doubtfu
P
I
P
r>
0
P
0
J
r
Total
(
Y
r
p
o
/f
/
/6
f t
Per Cent
Certain
1L
as
o.o
o.o
0.0
M.
18.1
5.f
9 I.I
Doubtfu
/•B
0.0
I'S
OJ
0-0
o.O
o.o
0-0
o.o
8.9
Total
in
i i
l*-3
9-0
Dt
4-0
as
/ • »
•m
10. g
190.
6~-3P /j'/Ar{JT£S
Number
Certain
4,
3
P
O
0
3
- 2 5
j_
Doubtful
P
If
0
O
0>
P>
P
0
1
/ /
Total
17
H
7
p
i>
0
J
3
2Z
If-
£0
PeiCent
Certain
2/7
6-7
SO
0.0
0.0
0.0
s.o
5.0
1>L1
11
m
Doubtful
Cl
0.0
C-l
0.0
0.0
0.0
OJ)
0.0
0.0
5.0
18.%
Total
28.1
C7
i n
0.1
9-9
CO
5,i
€ 0
3^-7
Cl
100.
S!?LJE/? yp /t/A/vres
Number
:ertain
0
O
0
. 0.
U\
Sr
P
Doubtfu
0
/
r
P
a
P
P
Total
r
r
p
ip
p
£/•
0
r
p
PerCent
Certain
J2.0
T.0
PO
00
0-0
0.0
/6.0
0.0
2J>.e>
0.0
760
Doubtful
P.O
0,0
20.0
P.O
P. (
Ao
\0. 0
•0.0
0.0
At-.o
Total
12.0
20.0
0-0
».0
0.0
(6.0
0.0
Zo.c
O.0
/OO
A/a r SrAr£&
Number
Certain
£•
?0
/y
-JZ
0
O
0
/?
Doubtfu
• (
3
P
(P
P
P
0
p
/.
/ /
Total
3/
O
P
0
?u
0
I'S
toz
Pet Cait
Certain
H.I
19 i
U.I
OP
0.0
0.0
3 3 . *
0.0
n.(,
1-0
Doubtful
10
10.8
3.9
0.0
0.0
0.0
0.0
0.0
0.0
Of
I5J
Total
S.1
W. V
0-0
0.0
0.0
OJ
17.6
2-1
160.
1
Evaluation
0-Balloon
1-Astnxumical
2-Aircratt
3-LiJtlt Phenoa.
4-Birds
5-Clouds, Dust, etc
S-lnsulfic Into.
7-Psycholofical
S-Unknoan
5-Otfier
Total
77!£L£ /?&/II £'l//)Ll'/9T/0/i/ 0A /p£Z. S/ //7~//l/(Z.
_JZ
0
0
7-
d
7
Doubtful
0
/
P
0
0
P
P
/
Total
Q
$-
1
0
0
p
0
0
p
5T
P a Cent
Certain
0.0
£0.0
/?•$
CO
0.0
O.D
P.O
0.0
P.C

0.0
/OO.
Number
Certain
/
Cl
j -
0
O
P
/0
Doubtful
O
P
0
)
0
O
O
P>
0
/
Total
/
If
P~
/
P
0
0
X
0
/ /
PerCent
Certain
I t
u-v
0.0
0.0
Q.O
--Q-0
Q.O
18.2
O.O
90.9
Doubtful
0.0
DM
94
O.Q
1-1
0.9
0.0
9.9
9.0
0.0
11
Total
1-1
3C-¥
2 7.3
0.9
f.l
9-1
o.i
0-P
i8.2
O.Q
100.
Number
Certain
0
/?
?
0
a.
0
0
0
j
Doubtfu
P
/
• /
0
0
p
0
0
0
x
Total
0
/
if
£)
0
0
p
3-
Percent
Certain
0.0
t 0
60.0
0.0
0.P
P.O
0.0
ft' '
0.0
60.0
Doubtful
0.0
200
Z0.O
0'
00
0.0
p.o
0.0
o.o
1/0-0
Total
0,0
2O.0
f0.O
0,0
0.0
0.0
P.0
0.0
0.0
0.0
/PO
Evaluation
0-Balloon
1-Astronomical
2-Aircraft
3-bght Ptienoa.
(•Birds
5-Clouds, Dust, etc
6-lnsuffic Into.
7-Psycho loiical
t-Unknom
K l O i x
Total
Number
Certain
X-
c
0
P
o
i
0
21
Doubtful
1
1
1
P
P
r
c
c>
r
Total
3
1
/
P
0
/
/3
PerCent
Certain
I/-5
0.0
to
0.0
1.9
0-0
jo.o
7.7
$0.2
(Doubtful
18
3-9
3,8
18
O.O
Q.O
0 0
18
, o.o
o-o
III
Total
1/5
U
I S.I
I f
o.o
0.0
IS
If
7 1
/Si.
Number
Certain
3
X
. J
0
0
1
0
7
/ ?
Doubtful
- P
/
H
P
r>
&
. 0.
P
O
f
Total
X
U
6
/
0
P
0.
7
3
Per Cent
Certain
8-1
n-S
2-1
4-2
9.0
o.o
¥.7
0.0
3U
17.5
lf.2
Doubtful
0-0
HA
/Cl
Q.O
0.0
0.0
Q.O
90
O.Q
0.0
30.8
Total
8.1
It, 7
IS. 0
9J
0.0
/J-5
/oo.
tfi/trf? 3P /V/AS^r&s
Number
:ertain
_J
)
/
. P.
O
0
0
7
Doubtful
/
p
0
0
0
p
0
p>
p
/
Total
/
Z
/
0
0
z
0>
p
8~
Per Cent
Certain
12.?
/ * • $
/2.S
o.o
0.0
0.0
1.0
2S.0
O.P
•
Total
21-3
C-0
i-C
1.9
0.9
i t .
H-i
/so.
155

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.