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.
100- 90- . 8 0 - 7 0 - 6 0 - 4- C d) O 5 0 - £ 4 0 - 30- 20- 10- 0_ Not stated Other Flame .enticularconico or teardrop Elliptical 23.5% /s 11.2 % \AstronomicaK N\\\\\\W 1 Aircraft I ^ ^ Balloon/ Insuf. info: \ ooooax •A- Unknown - 4.8% WT W o \ \\ > \ A47.0 7<A Shape i 10 2 0 30 40 -50 60 Evaluation in Per Cent i 70 8 0 i 90 100 FIGURE 15 DISTRIBUTION OF OBJECT SIGHTINGS BY SHAPE OF OBJECTS) REPORTED WITH EVALUATION DISTRIBUTION FOR EACH SHAPE .GROUP A-7493
Analysis, from the classic collection. 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.