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.
Total Less Unknown Per Cent 50 45 40 35 30 25 20 15 10 5i i i \ i i i \ i i r 00 Elliptical Rocket and aircraft Meteor or comet Lenticular, conical or teardrop Flame Other shapes Not stated 5 Unknown Per Cent 10 15 20 25 30 35 40 45 50 i i i i i i i i i \ FIGURE 22 COMPARISON OF KNOWN AND UNKNOWN OBJECT SIGHTINGS BY SHAPE, 1 9 4 7 - 1 9 5 2 _ A-7500
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.