Documents / Report
This is Project Blue Book Special Report No. 14, "Analysis of Reports of Unidentified Aerial Objects," Project No. 10073, dated 5 May 1955. The study reduced about 4,000 sighting reports received by the U.S. Air Force between June 1947 and December 1952 to IBM punched cards and analyzed them statistically, including chi square tests comparing knowns with unknowns. It concludes that the reports very probably do not represent technological developments beyond present scientific knowledge, and it notes that no case produced physical evidence.
“Otis”1 page
ErtuJtion
0- Ballon
I-Astnnonical
2-Aircrjfl
J-LlfM PflBKM.
4-Birds
S-Clouds, Dust, t i c
6-tnsrltit * f c .
7-Piydnlolical
t-Unkmmn
S-Otn*
Total
Nuntm
Certam
0
a
C
OD
J.'j
27.g
0.0
3Q.1
Si
111
Doubtful
SI
/I.I
/tf
00
r ox>
Total
U.7
'(•7
/(•/
Of?
O.l>
J7»
Co :.',
9 0
3rd
2 7 3
/ ^
Number
^Htain
/
c
0
0
0
• 0
1
o.
9
Doubtful
0
u3
0
0
' (?
0
Q
0
0
$
Total
/
.2.
.?
r>
1
?
Pel Cwt
Col»n
HI
0.0
off
£.0
_M
o.o
ILL
02.2
111
Doubtful
0.0
111
333
0-0
P,Q
0.0
0.0
r,.j
0.0
Total
/ / /
M-2
33.3
O.o
/•e
OJI
/',/
160.
Numbcf
;«tan
0
1
0
0
Q
0
0
1
0
M
Doubtful
9
1
1
0
0
0
{z
1
0
p
P
0
3
0
(,
PnCent
Certain
0 0
It.l
0.0
0.0
00
OS)
A?
SO.9
DouMtuI
0 0
/(•?
/(•7
00
0.6
at
o.p
ao
0.0
33.3
Total
/•O
I3.
p.o
33.3
0.0
0.0
0.C
(6-7
0.O
o.o
6.0
/It.
r j
r Evaluation
O-Balloon
l-Astronomical
7-Aircntl
|3-Li|fit Phenom.
•-Birds
5-Ctouds, Oust, etc
6-lnsuflic Info.
7-Psycholojical
S-Untanan
Mther
Total
Evaluation
O-Balloon
I-Astnnomical
2-Aircraft
3 - L I J W Pnenoa.
•-Birds
5-Clouds, Dust, etc
junsuffic. Info.
'/•Psychological
8-Unknoxn
9-Ottiel
Total
Number _ j
Certain
/
/
o
0
•
0
3
Doubtful
0
0
Q
0
/
r
r
0
/
Total
|
0
1
0
1
0
0
/
0
H
Certain
0.0
z?.0
0.0
0.0
0J\
0.0
0-0
zro
0.0
7S.0
P a Cent
Ooubtfu
Jo
0.0
0O
6.Q
0.0
p.o
0.6
0.0
3S.0
Total
04
?S~.0
o.o
0.0
0.0
O.O
?£O
0.0
/Of.
Number
Certain
/
2.
J_
C
0.
0
0
i
Doubtfu
c
c
0
0
o-
0
0
I
Total
1
o
0
0
%
0
2
is
P a Cent
Certain
0 1
LZ
o.o
Oo
p
O.o
Cl
Total
7L0-1
6-7
0.0
o.o
0-0
13.3
0- 0
#0.0
/3.3
/DO.
Certain
C
Q
1
0
0
o
D
0
0
0
1
Number
Doubtful
c
0
0
00
0
Q
o
0
,77'A
Total
0
0
0
i?
p
o
0
t)
0
1
&s rat?
Number
Certain
t
0
0
o
0
G
_$_
0
/8
Doubtful
0
I
0
0
0
0
Q
0
1
Total
/
t,
if
0
0
0
0
0
8
0
/?
,£-
Certain
0.0
0.0
/OLD
04
OB
_ M
O.(i
6.0
0.0
-&&.
ftl-9
P a Cent
Doubtful
/to
00
o.O
0,0
0.0
0.0
4*
0,0
0.0
6.0
Total
0.0
00
/60-0
0.0
0.0
0.Q
0-0
0.0
0.0
lot-
P a Cent
Certain
5-3
7C-1
2/. 1
CO
o.o
Of
0-(j
o.c
o.O
H7
Doubtful
019
S3
OJ
0.0
0.0
0.0
0.0
0-0
ao
o.o
>p
f/.y
Total
D.0
37-5
/JS
0*
0.0
0.0
0.0
t2.r
/?.*•
Total"
8.3
to0.0
0,0
ao
ft?
0.Q
0.0
to
[00:
Nuabn
Certain
/
(5
f0
0
3
Q
7
/9
Ooubtfu
/
0
6
O
0
0
0
p
0
Total
Z
0
j
O
0
3
0
7
f
Certain
1.1
0.O
i-1
Cl
ap
00
0.0
fid
£.1
SIS
'eiCtnt
Doubtful
6-2
L 0e>
0.0
/•3.
ao
0.0
ao
0.0
0.O
GO
0.0
/o.o
/O.O
/o.o
6.0
904
Percent
Doubtful
0.0
fl.0
0.0
0-0
0-0
0.0
0,0
0-0
0.0
f)O
/0.6
Total
&£.
0.0
0>-P
/O,0
(6.0
/o.o
10,0
/oo.
I
128 Report, cited by the archive. 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.