Documents / Report
This is Project Blue Book Special Report No. 14, "Analysis of Reports of Unidentified Aerial Objects," Project No. 10073, dated 5 May 1955. The study reduced about 4,000 sighting reports received by the U.S. Air Force between June 1947 and December 1952 to IBM punched cards and analyzed them statistically, including chi square tests comparing knowns with unknowns. It concludes that the reports very probably do not represent technological developments beyond present scientific knowledge, and it notes that no case produced physical evidence.
Insuf. info. = 4.2 % Unknown nomicalUnknown 100% /Aircraft Aircraft \/Excellent 757= 34.5% Doubtful Unknown A s t r o - N nomical 74=23.0% nomical 154=19.4% /97*I2.2% /ircraft i98=24.9 Other V '00%/Aircraft 166 = 22.0% info. 111 = 40%/Balloon 131 = 16.5% Balloon 127 = 16.8% Insuf. info. 27 = 3.6% FIGURE 8 DISTRIBUTION OF OBJECT SIGHTINGS BY SIGHTING RELIABILITY GROUPS WITH EVALUATION DISTRIBUTIONS FOR EACH GROUP A-74B6 24
Report, cited by the archive. 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.