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.
m 1947 117= /Q94 8 %/ 143 = 6 3 % < i 9 4 9 , X 9 - e % 186 = 8.5 %, I95O 209= VI952, 1501 = 68.3% 1952 1722= 74% 1952 2018 = 630% 1951 160 = 5.0% Object sightings 2199 =100% All sightings 3201 = 100% Unit sightings 2554=100% FIGURE I FREQUENCY OF SIGHTINGS BY YEAR FOR OBJECT, UNIT, AND ALL SIGHTINGS A-7479 17
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.