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.
3 0 2 0 10 0 10 3 I 3 0 20 10 Certain 0 Per Cent 2 0 3 0 1 1 All years 947 948 949 950 9 5 1 95 2 All years 947 1948 949 9 5 0 95 1 9 5 2 All years 9 4 7 19 48 9 4 9 9 5 0 95 1 95 2 r I 1 tz | 1 [ c 1 r C —" 1 1 1 I 1 i i 1 I I 1 Astronomical Airc I Ball | I Insuf. Unkn OH 1 1 i 1 i I j raft 1 I I 1 I 3ons 1 i i info. own »er I 1 i i i • - All years 1947 1948 1949 1950 195 1 195 2 All years 1947 1948 1949 1950 195 1 1952 All years 19 47 1948 1949 1 9 5 0 195 1 1952 10 20 Doubtful 3 0 FIGURE 6 DISTRIBUTION OF OBJECT SIGHTINGS BY CERTAIN AND DOUBTFUL EVALUATIONS FOR ALL YEARS AND EACH YEAR A-74 8 4 2 2 • v
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.