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.
TABLE IV CHI SQUARE TEST OF KNOWNS VERSUS UNKNOWNS ON THE BASIS OF SHAPE Total 1765 434 434 Shape Elliptical Rocket and aircraft Meteor or comet Teardrop, lenticular, or conical Flame Other Not stated Number of KNOWNS 838" 80 55 103 96 193 400 Adjusted Number of KNOWNS (K) 206 20 14 25 24 47 98 Number of UNKNOWNS (n) 195" 33 4 22 10 54 116 X2, (K-n)2 K 0. 59 8.45 7. 14 0.36 8. 17 1.04 3.30 29.05 D e g r e e s of f r e e d o m 5% 1% 12.6 16.8 64
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.