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.
“R.G.”3 pages
Evaluation
0-Balloon
1-Astnnowcal
2-Aircraft
3-LiiM Pnenom.
4-Birte
S-doodj, Dust, etc
C-bnaffic M o .
'• Psycho lofi CM
S-Urrkaow
M H t u t
Total
g
Number
Certain
2-
7
1
0
$
JJL
Doubtful
3
//
2-
0
0
0
0
/
2_
If
Total
5
f
I
0
0
3
3
It3
7
p/y
Certain
» • *
1?.?
l/$
/ i
0.0
0.0
Vj
,?1
i k
> « C m t
Doubtful
Y.I
/r.a
0.0
0.0
0.0
0.0
/ £
0.0
4/1
Ay
ToUl
fa
37.7
/4-J
IL
0.0
0M
4-7
47
4-7
1*.
r 6£/S//7-A'Erss
Nunbet
Certain
7
32-
o
-Ai
/y
jl
XJ_
6
IJ1
Doubtful
(7
2-7
3
/
0
O
£_
60
Total
IS
Sf
J
X
1
IS
H-
i
179
Certain
K.I
Jl
17-f
0J
0.
0
0
0
0
0\
0
.0
+
DoubHu
0>
/
0
0
/
0-
/>
Total
/
0
0
D
1
0
0
0
0
P«Cent
Certain
ay
0.0
CD
JA
0.0
0.0
0.0
do
0.0
O-O
66-7
Doubtfu
f{.7
0.0
0.0
0.0
/*• 7
00
0.8
0.0
£0
3Z3
Total
#7
/{.7
0.0
0.0
0.0
/6.7
0.0
00
•OJ
/?f?/6HrF8 rtf/iy MooAt
Number
Certain
J*L
JA
~l
-±
. 0
M
LL
-1
ZIS
Doubthi
ti
4/
3
0
0
0
0
0
4'
//?
Total
3S
130
41
?
I
0
tt
/r
33y-
PdCent
Certain
JA
SM
AA
/ /
Ad
0>.t
0.0
O.L
/r.3
Ad
AM
Doubtful
at
0.0
0.0
0.0
0.0
0.0
IS
Total
in-i
*)4
ir-3
A.7
0 3
0,0
t..o
11.2
+.s
100.
NunAer .
Certain
A
3
S
/
0
0
0
0
//
0
JZ-I
Doubtful
0
f
2-
2-
0
0
0
I
0
0
/3
Total
/
/ /
7
3
0
0
0
(
II
0
3H-
Percent
Certain
J-lft
IY.7
JA
AO
0.0
0,0
0,0
m.
m
Doubtful
0.0
i ^
5f\
0.0
0.0
0.0
?1
0.0
0.0
JfJ.
Total
M.7
M
00
0.0
0.0
a.«|
0.0
J00.
Numbcf
Certain
S
6
S
_JL
-JL
3
_£
J4-
0
Douutfu
3
X
3
/
J
&
0
Total
%
6
2-
1
0
3
IC
?
P a C n t
Certain
MA
11.1
Cl
1.0
0.C
0.0
(,.)
do
16.H
/.o
57.1
Doubtful
i-l
IIA
6.1
l-o
1 0
O.0
v./
0.6
4-1
U2.f
Total
to, 3
ft.*
12,9
fO
u
41
A»-t
<>-\
1st.
Evaluation
O-Balloon
1-Astronomical
2-Airctatt
3-UeMPhcnw.
4- Birds
S-Clouds, Dust etc
6-lnsutfic Info.
7-PsydvlO(ical
S-Unknoan
W ) t h «
Total
Ntflnbcf
Certain
/
/
J_
0
O
_£_
1
O
JL
0
$-
Doubtfu
/
0
1
0
0
0
0
0
0
Total
2.
I
2.
0
0
0
1
0
I
0
7
Pei C a t
Certain
/Jtl
0.0
M
JM
/U-.3
0.0
Uh3-
JLO
Doubtfu
/A3
0.0
0.0
0.0
0.0
0.0
0.0
10
0.0
ISA
Total
ty.3
Uf.6
10
0.O
0.0
/Hr3
0.0
>+3
0-0
/op.
Number
Certain
me
ISA
231
l l
-JJ.
_JL
/til
-21
m.Si
V0~?4
Doubtful
7f
Iff
i?-0
f
/+
0
3
0
/ /
Total
7-19
772
311
2-1
' /*>
•6
/u
77
1443
P e Cent
Certain
9.i
IAl
11.1
AA
O.f
6.1
I3.Q
JA
i-l
Doubtful
td
4-I
4-3
0-1
6.1
^•?
0.0
0.1,
0.D
04
Ml
Total
•\\s
(.1
OA
/3.0
a.a
^4
/to.
Nutter
Certain Doubtful Total
Percent
Certain Doubtful Total
Number
Certain Doubtfu Total
t
PerCait
Certain Doubtful Total
212
, 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.