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.
100- « 90- O g" 80- S T O - c £ 60- = 50- < i^ 4 0 - -«— v 30- « 20- 1.0- No. of all sighting 3201 All yeors 117 205 164 306 160 2018 O Location not stated Outdoors In bldg. In plane In car '' / / / ' & s \ \ \ \ \ \ \ \ \ \ \ \ 4 1 1 1 1 1 1 1 1 1 1 / / / / / • K s \ ^ \\\ \ *** • - 1947 1948 949 1950 1951 1952 100 9 0 •8 0 70 • 6 0 50 •40 •3 0 •2 0 • 10 .0 FIGURE 17 DISTRIBUTION OF ALL SIGHTINGS BY OBSERVER LOCATION FOR ALL YEARS AND E A C H Y E A R
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.