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.
Unknown 4 3 4 = 19.7% '952 Other 233 = 10.3% Astronomical 479 =21.8 % 1947-51 C l n s u f . info./ \ \ 240=10.9%/ w / Balloon / 339 = 15.4% 1952 Aircraft 474« 21.5% \ y \ / \\9*x \ S I FIGURE 3 DISTRIBUTION OF OBJECT SIGHTINGS BY EVALU- ATION FOR ALL YEARS WITH COMPARISONS OF EACH YEAR FOR EACH EVALUATION GROUP A-7481 19
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.