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
Evaiation
O-BalloM
i-AstMMical
2-AiraaTt
3-LijM Phenoa.
4-Birdj
S-Clouds, Dust, etc
6-tarflic M > .
7-Psydioloticii
Total
f J£ tv/U/) i £>* t£ss
NumMr
Certain
3
f*
t f
0
70
2
7
736
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3
77
P
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- 7
P
P
3
?%
ToUl
•6
'r?
g_
0
70
'0
5L3fy
Per Cent .
Certain
/3
3S:D
0?
AO
P.D
4.3
-^1
y.o
Si/
Doubtful
A3
3A?
&W
0&
P.O
PO
/•3
Total
£7.9
/J4
P.?
P.P
0.1/-
43
P-f
4.3
6>o.
Number
Certain
_ ^
/2-
_L
P
/ / /
03
Doubtful
J
17
P>
O
£?
P
£•?
Total
5~
fi-3
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1
0
0
6
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Percent
Certain
2-2
13-Z
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0.0
Off
PO
/s~4
2JL
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3-3
J17
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t.p
0.0
0.0
0.0
p.o
0.0
30.7'
Total
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2-4
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Total
%
33
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2-
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3
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2-X
t*3
P>7
P.6
74
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0.P
JL?
3Z.4
Total
rf
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7?i
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Number
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IE23
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P
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13
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9
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0
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3 /
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p>
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33
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23
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75
42.
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'•7
Total
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00
13
7-7
4.3-
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Evaluation
O-Balloon
I-Astmoaical
2-Aircntt
J-LifhtPrnnoa.
4- Birds
5-Clouds, Dust etc
S-lnsuffic fnfo.
7-Psycholoflcal
8-Unknoan
Mttier
Total
Evaluation
0-Balloon
1-Astmomical
2-Airuafl •
3-L.fht Ptumau
4-Birds
5-Clouds, O u t , etc
6-lrtsuftic Ufa.
7-Psycaolo(ical
8-Unknow
9-0 th«
Total
6/ ?>£s - S Aj/Aiisres
Number
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p
0
t t
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9
713.
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'2?
f
3/
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J
0
2,
/
7S
Total
73
63,
P
3
'f
7/?
Per Cent __j
Certain
7J&
P.P
3.4
Doubtfu
/at
3.0
/'.£
P4
no
77
P.O
P.7
04
ZS.0
Total
£74
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67
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Number
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&
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0
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M.
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£05
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3/
II
2-3
3
P
0
0
P
3
72-
Total
u
49
f
P
2-P
9
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7-7?
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Percent
Certain
70.5
M
2.1
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MO
Doubtful
£3
0.0
pif-
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f.O
UP
Total
37.1
MS
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3.3
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3.2-
/7.3
5:/
100,
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21
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4
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4
2-
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0
Total
34
33
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£~
4-
17
43
Percent
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2P4
20s
Number
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P
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7
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4
0
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0
/
0
P
P
£>
P
0>
P
3
Total
0
//
0
P
0-
2-3
PerCent
Certain
43
0.0
0.0
0.0
Z7
Jl
11
43
Doubtful
17.0
0.0
0.0
PP
0,0
00
0.0
P.O
41
39./
Total
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PO
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27
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n
u
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Number
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p
0
/
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$
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P
7
7
P
P
P
P
0
p
Total
0
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/
0
JL
_£_
9
PerCent
Certain
O.O
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III
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0.0
0.0
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0.0
444
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0.6
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33-J
O.O
0.0
p.0
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0.0
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5S-,£
Total
00
77/
I/./
P.0
p.P
/ / • /
P.0
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P.O
700.
Evaluation
O-Balloon
1-Astnroaical
2-Aircraft
J-Lijtil Prawn.
4-Birds
S-Clouds. Oust etc
Hrwrlfic pfc.
7-Psycral0|ial
t - t M o m n
Total
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Certain
A
/
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P
P
P
2.
7
3P
Doubtful
f
P
f
P
P
0
p
I
0
/ • * / •
Total
" / /
fi
fi
0
7
1
M4
Percent
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/?.&
66
7-9.5
00
P.0
P.t
45
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£3
£1.2
Doubtful
0.0
ttx
6.0
00
00
P.O
P.0
ao
31. f
Total
2S,0
0.0
M7-7
0.0
00
O-o
4.5
46
&
6-JV Af//v//r£s
Nuaber
Certain
5
2~
S
0
0
1
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PS
Doubtful
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3
rp
0-
p
0
p
0
0
7/
Total
$
sr
7P
3
p
P
/
0
36
PerCent
Certain
m
sz
f3.f
13
0.0
2$
PO
111
%3
694
Doubtful
O
13. f
P.0
P.P
&t
P.0
0.P
O.0
PO
30.6
Total
73f)
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p.c
A*
P.0
JL
UL
IT.
Doubtful
/
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3
0
0
t//?ti/ A/ar Sr^r/io
Number
Certain
7
/
p
7
U2.
11
JL
37
Doubtful
,2.
,2.
5>
O
0
P
0
P
A
9
Total
S'
/
7)
p
7
/ /
PerCent
Certain
Jf.3
6f
/M
2.Z
OP
P.O
7^2-
0.0
27.9
%7
Z/,4
Doubtful
4.3
AO
{>.£>
0.P
0-0
0.0
0.0
43
/f.S
Total
# £
70.1
U/
O.O
O.P
I5~2-
0.0
2.3.9
/F.O
I0O.
2 3 8 Report, cited by the archive. The PDF is mirrored here; the original link is above. 309 pages are in the text index: search them above, or from the library's search.