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.
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c J Evaluation 0-Balloon 1-Astronomical 2-Aircratt 3-lijht Phenom. • 4-Birds 5-Clouds, Dust, etc. e-lnsiffic Into. 7-Psycto l o p o l 8-Unknown 9-Othei Total r#6l£ /?/07 . £//>L/>tinOA/ 0fr Total s 0 0 0 o 0 Per Cent Certain MS. 6-7 £0- o.o 333 iOO Doubtful 20.0 00 / / / 0,0 Q/? 0.0 00 00 O.0 6.7 t/00 ToUl &3 ?O.0 GO 00 0.0 00 0-0 t-r 100. Number Certain g_ 0 0 _j2_ / 0 0 DouUfu 0 0 0 0 0 0 0 0 0 / Total 0 t; 1/ 0 0 0 f 0 1, IP /I Percent Certain 2£o 25.0 0.0 0.0 O.O £•3 0-.O 17.4 /?.(? 9*1 Doubtful 0,0 / t * 00 00 fit? At? 0.0 00 00 #0 6-3 Total 0O 1/.? 2S.O 0.0 0-0 0.0 1-3 0,0 0O /OO- Evaluation O-Balloon . l'Astronomical 2-Aitcratt 3-Li£hl Phenom. 4-Birds 5-Clouds, Dust, etc. frlnsutfic Wo. 7-Psychological 8-Unknowi Mttier Total H/)t/ Number Certain s s s 0 / s Doubtful 2 / 2 0 0 & o 0 2, 7 Total / / 7 f / 3 0 £ £_ Percent Certain 1LS. HU- LL Ll- JL& M- Doubtfu *•? f.f o.o o.o O.0 0.0 ao 00 5-9 20.& Total 324 It O.r? 2-9 It O 0 t. $ /0O. Jf/A/£ Number Certain -J3 SL ^ _ 0 t? j 37 Doubtful s 0 S3 0 0 a Total tf. 2. $ / o 3 ? 43 PerCent Certain 30.2 £L //(, *f 00 ao 10 93 to? 0.0 W./ Doubtful 7.0 OO 70 O-ff OO 0.0 0.0 O0 0.0 0.0 /3-9 Total 37.2 4-7 /$.(. 23 0.O 0.0 1,0 f.3 20? 00 100. Number ;ettain 24. // J / 22 _JL 93 Doubtful / 0./. /9.O 0.0 0-0 tt. 7 Total ILL 90 If. 7 4-/ 0.O /3.I OS /%.o 4/ /oo- Numbtr Certain & 1/ 0 2 /Z sl- Doubtfu / / I 2 /7 O 0 / 0 O 0 *</ Total 10 13 / p z 12 •T ft P e r c e n t Certain 111 £.4 'JLL 0.0 jQ£L 2Z JLL 4.3 63-4 Doubtful /Y.O 1.1. /t.s 0.0 a,o / • / 0.0 0.0 0.0 / • / u/, Total 32.3 /fft 2tf.7 4.2 ao U b.4 22 /2.f 5.4 ,0/, Evaluation O-Balloon 1-Astronomical 2-Aircraft 3-Light Phenom. 4-Birds 5-Clouds, Oust, etc. 8-lnsuffic. Into. 7-Psycholosical B-UnVnoM 9-Other Total Number Certain J z g_ 0 _^_ o * /& Doubtfu 2 2 g_ / 0 0 0 / / < / Total •9 0 '0 0 7 20 Percent Certain JM. 3.3 MIL ao /O.O o.o 23.3 53.3 Doubtfu C7 U-7 3.3 OO 00 no 00 0.0 3.3 4(.-7 ToUl JL-J- IM. 6-te 0 0 0-0 no U /CO. Number Certain 2. y £_ 0 / _ _ ^ 3 _J2^ Doubtful 2 / 0 0 /3 Total / 3 3 3 / O / o 3 O 22 Percent Certain 9/ 45 45 ao o.o o.o /3.L ,00 40-? Doubtful 27.Z ?•( ?•' 4S ao 0-0 00 o.o 0.0 59./ Total 3C3 at. l i t /u 0.O 4.s O.0 0-0 /SO. Number Certain 2 3 0 0 / 0 ff /3 Doubtful J f 0 0 0 0 0 0 /9 Total 9 C s Z o o / o , P e r c e n t Certain M. AIL 3.1 ML /2A. JLL J2JL Vat. Doubtful 2/9 9-4 Is.o 3./ 00 0,0 0.0 f?,O 00 0.0 Total U2 /ft 2SO /, 2 &JL 3./ li7 £L£L Nunbn Certain 2. _^_ / -J2- ^ / 2/ Doubtfu / / 2 0 0 0 IP 0 0 0 4 Total 3 s / 0 O Z t 2 ^ Per Celt Certain S.0 zeo f-.o 4.O 0.0 O-D 1.0 fzO 32.0 f-.O S¥rO Doubtful (+.0 r.o 0.0 0.0 0.0 0.0 0.0 0.0 /i.O Total /Z.C to 0.0 a.o -g.o '/rO /oo. 170
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.