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.
3 0 2 0 10 0 10 3 I 3 0 20 10 Certain 0 Per Cent 2 0 3 0 1 1 All years 947 948 949 950 9 5 1 95 2 All years 947 1948 949 9 5 0 95 1 9 5 2 All years 947 19 48 949 9 5 0 95 1 95 2 r I 1 tz | 1 [ c 1 r C —" 1 1 1 I 1 i i 1 I I 1 Astronomical Airc I Ball | I Insuf. Unkn OH 1 1 i 1 i I j raft 1 I I 1 I 3ons 1 i i info. own »er I 1 i i i • - All years 1947 1948 1949 1950 195 1 195 2 All years 1947 1948 1949 1950 195 1 1952 All years 19 47 1948 1949 1 9 5 0 195 1 1952 10 20 Doubtful 3 0 FIGURE 6 DISTRIBUTION OF OBJECT SIGHTINGS BY CERTAIN AND DOUBTFUL EVALUATIONS FOR ALL YEARS AND EACH YEAR A-74 8 4 2 2 • v
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.