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.
“Harder”1 page
TABLE VI CHI SQUARE TEST OF KNOWNS VERSUS UNKNOWNS ON THE BASIS OF SPEED Speed Number of KNOWNS Adjusted Number of KNOWNS (K) Number of (K-n)Z UNKNOWNS (n) K Stationary L e s s than 100 mph 100 to 400 mph Over 400 mph M e t e o r - l i k e Not stated 249 154 181 4 0 3 ' " 8 3 695 61 38 4 5 99 20 171 Total 1765 434 53 26 58 145 " 16 136 434 1.05 3.79 3.76 21.37 0.80 7. 16 37. 93 D e g r e e s of freedom 5% 1% 11.1 15. 1 66
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.