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.
“The Advance”3 pages
Insuf. info. = 4.2 % Unknown nomicalUnknown 100% /Aircraft Aircraft \/Excellent 757= 34.5% Doubtful Unknown A s t r o - N nomical 74=23.0% nomical 154=19.4% /97*I2.2% /ircraft i98=24.9 Other V '00%/Aircraft 166 = 22.0% info. 111 = 40%/Balloon 131 = 16.5% Balloon 127 = 16.8% Insuf. info. 27 = 3.6% FIGURE 8 DISTRIBUTION OF OBJECT SIGHTINGS BY SIGHTING RELIABILITY GROUPS WITH EVALUATION DISTRIBUTIONS FOR EACH GROUP A-74B6 24
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.