Documents / Analysis
Special Report No. 14 was issued by the U.S. Air Force's Air Technical Intelligence Center on 5 May 1955. It is a statistical study of about 4,000 reports of unidentified aerial objects from June 1947 to December 1952. The reports were reduced to IBM punched cards and analyzed with methods including chi square tests. The report concludes that the reports it examined are very unlikely to represent technology beyond present scientific knowledge, and it notes that no case produced valid physical evidence.
“R.G.”3 pages
Evaluation 0-Balloon l-Astmmicil 2-Airtraft 3-Uiiit Plwnon. 4-Binb 5-Clouds, Dust, e t c frlmltic Into. 7-Psrcholo|ial t-UnkKnn Miner Total •5 £ec Certain / J£> 7 / 0 3 ff / A J 63 Number Doubtful 4o / / 2 0 o 0 1 &-0h/// Per Cent Certain 3.O ISA #• 0 0.0 M- S.0 14& Doubtful 60 4y As 00 0/0 /•S~ 0.0 00 2f-4 ToUl f.0 23,9 P.0 7* /* /00. wH/r£ JJ-c »» J Number Certain O z 0 0 0 a 4t Doubtful / A 4 0 1 0 0 0 0 8 ToUl / •'4 0 •r 0 /A 0 0 / J - / 39 4- 11 Doubtful / US Si. /00. £~30 /Is*/V 7~£"J Number Certain -u?7 A3 j - .A. Doubtful r A4 0 0 6 0 0 0 44 ToUl M' /t / 0 0 f 2/ a- 7* I Percent Certain AM Tsui Ji 0.0 0.0 1.4 #7 77.4 -LZ- Doubtful AU 4.1 0-0 00 0.0 00 00 MA Total $19 /¥.$ 4? 00 00 V/ ff-f/ (•7 Oj tf/t less. Number Certain £_ / , 0 / / (, 71 Doubtfu I c 0 0 0 0 0 O 0 1 Total .rj z / 0 / / Certain 1-7 3:( 71? S-f ft ?.f 23-/ 77 k-4 Percent Doubtful JSi 17 23.1 0.0 00 -0J2- 0.0 0.0 0 0 0.0 341 ToUl // 5 sat xt -?•# 0.0 ?f 23.1 77 /00. '/0/U Certain a 0 ft a 0 0 / 4 / 3 0F f/0n/ Number Doubtful A / / 0 0 0 0 0 0 t> /9Z. C /o Total Z 2. 9 0 / O 4/ 0 A1 L S 2£ /&//7~ Percent Certain 0.0 0.0 00 0.0 J2J2- 2// 0.0 Doubtful /0£ s.s 53 0.0 0.0 0.0 C.0 0.0 0.0> SA-t. Total /& fl?£7 fee" Certain /•g 311. &£. 0.0 UJ r/*)/es •ALL./ 'J>S. Percent Doubtful If 0.0 At 00 0.0 0.0 / • 0. V £ 04 0/.0£ J££7 s 70&TI50 Certain 0 0 / 0 0 /0 / S3 Number Doubtful 7 1 0 0 .0 0 0 0 72 ToUl / / 7 P 2. 0 / Certain 0.0 srg 00 2.2. 0.0 0-0 22.2. 2.Z 133 'erCent Doubtful 44 /£.(. J-2 0.0 0.0 0-0 0-0 0.0 0.0 2 ^ Total ZT 2.2 2.2 0.0 #(? 2Z-Z 2.1 /00. Evaluation 0-Balloon 1-Astronomical 2-Aircraft 3-Lijht Ptienoa. 4-Birds S-Clouds, Dust, etc (-Inuffic »lo. 7-Psydnk>|ial S-UnknoM Mttwr Total &/ Seee^D*. Number Certain 20 / / 0 77 Doubtful 7° 0 / j " / O 0 O 0 0 3 29 Total J/ 1 ^ ^_ 0 i t 2C fff- Certain in AS A64 0? 0.0 A4.1 0g nt A 7 7/4 'erCent Doubtful 1.4 0.0 /2C 0.r 0.0 0.0 0.0 j.±~ 244 ToUl 2.66 at ?f-S0 tf,^jT 3e> M,«/vres Number lertain JJL 0 a a 4g Doubtful 4 / 2 0 0 0 0 6 0 f ToUl V 0 0 s 0 27 Percent Certain 74.2 J.s- $. 0 £-.3 0.0 41.4 Ml Doubtful 1-0 Ai a0 0.0 0.0 0.0 0.0 0.0 txt ToUl 26,3 7, ' 7-0 O.o. 00 S.S ty</ /00. Number Certain JL 23 / 0 AL a AIL Doubtful 4 3 S 0 / 0 a 0 a 0 76 ToUl 7/? / J7 7 0 2.? / 2? _2__ 727 Pet Cent Certain n.t, s./ /S.I 0.0 0.0 0# 22.8 11 $7.4 Doubtful S.I 6 3 t-0 0.0 00* 0.0 00 0.0 /2-b Total Z5-.7 2Y.<7 0.g 0.g 0.0 220 0g 22.$ 7/ /00.
Analysis, from the classic collection. 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.