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
4£.- 1 ! Evaluation O-Balloon l-Astfonomical 2-Aircralt 3-Li|M Phenom. 4-Birds 5-Cloudj, Dust, etc 6-lnsuflic Wo. 7-Psycno logical 8-Unknown J-OBiet Total Nunbtt Certain 17 f / 0 0 2- 14 1 £~l Doubtful 13 ' 3 0 0> 0 O / 0 3 _££ Total 3D II I 0 0 I, 3 III Pet Cent Certain 12-1 '0.J 11 O.O 0.0 7.6 Id 1*1 /•3 610 Doubtful y.o 0.0 O'O I?A o.o 1-3 0-0 //.t> 3J.0 Total S.0 1*7 1.3 0,0 o.O Td 4/.o 7JT.7 160. Number Certain // 23 0 / / 17 X 33 7 133 Doubtful /? /o 3 I o0 0 z_ 66 Total Y7 7-1 ao0,0 /•0 O'O /.o Total jl.S /.r l-o r r lU 'GO, SL>fi/1~l6H7~ O/V P/./tsTF/r Number >rtain II 9 6 D 0 0 ^ 0 Doubtful t 3 (2. / / a- 0 o 0 0 £7 Total If 12 If1 1 2_ 1 0 II 1 Per Cent Certain /y.f T.I 0.0 0.0 /JA 01 m22 ',"3.6 Doubtful US y.j H.% / • y M 0,0 0.0 0.0 Total 16,3 34.3 14 -JA. 1-1 III 113 M (00, . VtlNA/G/T CW S70HZ Number, Certain 0 0 / 0 Doubtful £__ / 3 0 I 0 0 0 0 0 7 Total 4 3 3 0 I 0 I 0 f JL If Percent Certain /a.5 /OS 0.0 0.0 0.0 0.0 5.3 0.0 X.S /i.5 Doubtful /6£ /j-T 0,0 $•9 0,0 00 O'O 00 $.0 Ji.f Total 21.6 IS* is.% S3 0.0 AO 26.3 16.5 Evaluation O-Balloon 1-Astnnoinical Z-Ai rcraft 3-LiJtit Phenom. 4-Birds S-Clouds, Dust, etc 6-lnsuffic Info. 7-Psyctolo|ical S-Unknoon 9-Ottitr Total Sl/A/l/ J~ OoUbtfu 0 / 0 0> / 0> 0 c Total 1 0 0> 0 i o 0 f I? 7 Pet Cent Certain 57.1 0.0 M O.O O.O JA O.O 0,0 (M. M Doubttu 0.0 00 0.0 0.0 /fh.3 0.0 o.oD.O 0.0 ToUl f7.l /#3 t>,0 0.0 0.0 Ith3 0.0 0.0 0.0 /PD. &ffit;//r£/? r#4/s Alto* Number Certain / r /4Z 6 _± ..&XI 3 JLL _± }S0 Doubtful •3 0 0 0 0 6 /3S Total 31 IfO ? 1 0 XI 71 if 3ZS Percent Certain JA XA t.l l.i ft.l to m Doubtful If.I 11H 0? i>.o o.o 0.0 0.0 0.0 14 Total / M 1-/.t I7,l ? f 0.0 ox 3-9 l»o, Number Certain / J r UL. 0 0 0 0 1/ __£_ Doubtful 0 ? 0 0 0 I 0 Total / IX 10 3 • 0 0 0 1 If 1? Percent Certain £ i 75 3.1.) %-l 0.0 IM Doubtful 0.0 2-3.1 $J Jfi 0.0 O.0 0.0 At ao oo Total lit* a 6.4 0.0 0.0 0>J O.o Number Certain s £ 3 / _L 3 0 JO 0 Doubtful H- // 3 / / 0 £> 0 3 ToUl f 0 •3 /P Per Cent Certain // .1 6.1 a M Si aIt.5 0.0 Doubtful 7.i S.l /•I /•1 ao 0.0 ,?.7 0.0 ,f.l Total M LI-3. 3? AD S.L 3-1 ^ n Evaluation O-Balloon 1-Astronomical 2-Aircraft 3-Lfjht Phenoin. •-Birds 5-Clouds, Dust, e t c G-lnsuffic' h k . 7-Psycholoiictl t-Unknomn 9-Othejr Total Number Certain / / 0 0 1 c 6 Ooubtfu / 0 1 0 0 0 0 O 2- %OJ. Zf mo Doubtful (31 II 6 A- 3 0 Total US 3U If 3£ 3W J£fs Percent Certain f.V 13.1 J1.1 •1A O.L 6.\ //.I 1.1 3S.\ i.l m. Doubtful t.9 6.L 6-0 o.l 6.* tf-1 Total 14 1-0 a3 il-1 M W\ 4o lot. Number Certain Doubtful Total PetCent Certain Doubtful Total Number Certain Doutitfu Total Per Cent Certain Doubtful Total 211
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