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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.
'•8;
•
Evaluation
0-Balloon
1-Astrenoinical
2-Aiicrafl ,
3-light Phenom.
4-Birds
5-Clouds. Dust, etc
6-lnsuflic t i n .
7-Pircnol
0
p
0
0
o
0
/£•
Percent
Certain
J.0
600
/2.3
0.0
0.0
0.0
MA
6-7
too
Doubtfu
0.0
20-0
0.0
rt.0
0.0
0.0
0.0
0.0
17-0
2i>0
Total
0-0
fr.O
tf-3
0-0
0.0
0.0
6-7
00
/oo.
/9S-/
Number
Certain
/
/
0
_0\
0
0
0
0
Doubtful
0
^
0
0
0
0
0
/
Total
0
a
0
0
0
0
£•
PerCent
Certain
0.0
20.0
20.0
0.0
O.0
A?.0
0.0
ao
¥0.0
/O0
W0
Doubtful
0.0
700
0.0
0-0
ao
do
$
AA£
77
0.0
0,0
00
0tO
0.0
0,t?
2S.A
Total
Hi
J0
00
Af.t
A0O.
Evaluation
O-Balloon
l-Astronoaical
2-Aircraft
3-Litfit Plwnoa. .
4-Birds
5-Clouds, Dust, e t c
6-lnsuffic kto.
7-Pjycholofical
S-Unknom
Mltir
-
Total
/tSO
Nnber
Certain
3
7
0
o
0
2
0
0
2</
Doubtful
/
f
s
o
0
o
o
0
f
Total
7
I
tp
p
s
0
5"
12
Percent
Certain
/%£
9./
2/'.2
0.0
0.0
0.0
9/
00
0.0
72-7
Doubtful
J0
f./
9. A
0,0
0.0
00
A A
273
Total
2/.1
Ag.2
20-3
0.0
0.0
0.0
?•'
0.0
4/
/00.
A?sr/
Number
:ertain
/
0
0
2.
0
5-
2-
A7
Doubtful
0
s
/
0
0
0
0
0
o
</
Total
s
^/
5-
0
0
0
2,
0
2,
2-/
Percent
Certam,
/ / /
4?
/f.0
£&
00
££-
9.s-
Z/.0
Doubtful
00
rf.3
0.0
0.0
00
0.0
0,0
0-0
00
/f,0
Total
19-f
fs.t
(?-0
0,0
00
?•*
00
23.g
t*
Nunber
:ertain
20
JJ-
4 /
— L J
4
3{
Doubtful
AJ
AO
2./
J
/
/
0
0
0
2,
Total
?J
27
7
2,
f
6.
36
7
/at
Per Cent
Certain
A2-0
A0.2
7^
£*/
&£-.
0.6
s.t
2/-7
S.0
t?3
Doubtful
fg
/7 7
A?
0b
0.A.
00
0.0
0.0
tat
Total
/f-g
27-3
42.
/•2
£V
f t
7/7
41
A00-
Number
Certain Doubtful Total
Percent
Certain Doubtful Toti
195 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.