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Project Blue Book Special Report (second copy)

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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.

Open the PDF at page 124 Original source ↗ 
* • # •
Percent
Certain
\
v
Doubtful Total
Ertnbon
O-Balleea
1-AstnnMial
2-Aircraft
3-LiiM Phenon.
*-Biids
5-Clowh, out. ttc.
6-lnniffic. Kb .
7-Piydiolo|ial
8-IMantm
9-Qtht>
NnriM
Certain Doubtful ToUl
rs •
V
PeiCent
Certain Doubtful Total
Number
Certain
i
0
2
0
6
0
~T
I
H-
1
12
Doubtful
0
1
0
0
0
0
0
0
0
0
1
Total
;
/
X
a0
0
3
/
4-
/
13
Per C w l
Certain
7.7
9.0
IW
CO
Q.Q
O'O
7il
3230.2
m
DoubtM
9J
7-7
OJ
M
o-d
O.O
Q.O
Q.O
O-o
gj
7.1
Total
1.1
-J.I
H-f
9-e
o.o0-0
•J3-J
7.7
30.9
7.7
no.
Number
;ertain
Q
_!__
0
i
0
0
(>
0
Doubtful
9
3
2
0
0
0
0
1
0
0
7
Total
c
s
2
/
0
0
(,
X
1
/5
n
P a Cent
Certain
13.0
4-7
0.0
2.2
0.0
0.0
I3.Q
0.0
37.6
Doubtful
0.0
0.0
o.o
0.0
o.o
0.0
o.o
15- X
Total
13.0
10.2
0.0
Q.O
If.O
f.i
(00.
Nun bet
Certain
0
Q
0
0
0
0
2
0
0
10
Doubtful
0
1
0
0
0
0
0
0
Q
1
Total
0
3
0
0
0
0
I
0
0
Q
II
Percent •
Certain
0,0
18-7
t:t
CO
Q.P
0-6
if. 2
Q.O
l.Q
90.9
Doubtful
0.0
1.1
0.1
0.(1
0.0
0.0
9.0
OJ
o.o
OJ
tl
Total
p.o
27.3
0.0
0.0
0.0
o.o
IB. I
0,0
o.O
IOC
c Evaluation
O-Balloofi
1-Asomoaical
2-Aircnft
K i | h t PhenM.
4-Birds
i-Clovds, Dust, etc
6-hsuffic Ufa.
7-Psycliolo|ical
S-lMnow
Mttier
Tolal
N w b a
Certain
0
1
Q_
0
0
0
1
1
.?
n
C
Doubthi
0
0
0
0
0
0
0
Q
0
0
0
Total
0
1
0
Q
0
0
1
1
3
0
Q
P a Cent
Certain
0.0
ten
CO
OJL
0.0
Q.O
!(,.!
(6.1
50.0
D.O
100$
Doubtfc
o.o
0.0
0.0
o.o
Q.O
(I-0
0,0
0.0
Q.O
0.0
0.0
Total
IC.1
0,9
9-0
0.0
0-0
Ib.l
It,.-]
fro
o.o
Iffo.
Nuabef
Certain
0
$
0
0
0
0
0
1
7
0
11
Doubtful
0
2
o0
0
0
0
6
0
0
1
Total
0
10
0
Q
0
0
0
1
0
/ 3
Percent
Certain
O.O
tV.J
0.0
0.0
(.0
o.o
0.0
7.7
0.0
BU
Doubtful
0.0
11-1
O.t
o.t
$.0
o.o
0.0
0.0
o.o
0.0
/S.I
Total
0.0
U.I
o.o
1,0
o.o
QO
o.o
11
IS*
(!•&
• '
100.
Nuiabet
Certain
0
• 1
0
1
0
0
0
0
0
0
2
Doubtful
0
1
0
0
0
0
9
0
0
p
1
Total
0
%
0
1
0
0
0
0
0
0
1
P a Cent
Certain
_M
23.)
0.0
13.3
O.t
O.O
0.0
O.O
0-0
0.0
Doubtful
0.0
33.3
Q.O
0.0
OJ
0.0
0.0
0.0
Q.O
OJ
33-3
Total
OJ
cu,OJ
333
0.0
o.o
(3.0
o.o
o.o
o.o
It*.
Number
Certain
0
0
0
0
0
J2_
0
0
0
0
Oouutfu
0
0
0
0
0
0
0
0
0
0
0
Total
P
5
0
0
Q
0
0
0
0
0
5
Percent
Certain
o-o
It 0.0
0.0
O.o
0.0
0.0
o.o
0.O
o-o
Q.0
IH°.Q
Doubtful
0-0
0- o
Q.O
O.O
OJ
0-0
0-0
6.0
o-o
0-fl
o.o
Total
0.Q
/0O.O
0.0
0.0
Q.P
o.o
OJ
ap
OP
/oo.
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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.