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.
“Jet Propulsion Laboratory”1 page
« * P * ^ ^ TABLE XIII CHI SQUARE TEST OF REVISED KNOWNS VERSUS UNKNOWNS ON THE BASIS OF LIGHT BRIGHTNESS Light Brightness Number of KNOWNS Adjusted X , Number of Number of (K-n) KNOWNS (K) UNKNOWNS (n) K Sunlight on mirror Sunlight on aluminum Sunlight on plaster, stone, or soil Brighter than moon i • Like moon or duller ] than moon ] Not stated *j Total •i i 24 136 63 143 4 2 878 1286 8 46 21 48 15 296 434 D e g r e e s of freedom 5% 1% 14 28 16 61 22 293 434 2.67 1. 19 3. 52 3. 27 0.03 10. 68 9 . 5 13.3 75
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.