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.
i 12/5 ' 4 3 > Other \ % 19 4 % Aircraft 23.6 % Insuf. info. 16.1% Balloon 22.6 % Insuf. info. 18.4 7. / \ Aircraft 36.9% Balance of Central Farwest Region 38 object sightings San Francisco 93 object sightings FIGURE 35 COMPARISON OF EVALUATION OF OBJECT SIGHTINGS IN THE STRATEGIC AREAS OF THE CENTRAL FARWEST REGION B-7513 51
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.