Project Blue Book Special Report No. 14: Analysis of Reports of Unidentified Aerial Objects

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.

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100
No. of object sightings
70 55 83
9 0
£ 8 0
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§ 6 0
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50
o 40
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o ,30
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10
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Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec
FIGURE 14 DISTRIBUTION OF OBJECT SIGHTINGS BY MONTHS AMONG THE EIGHT DURATION
GROUPS FOR ALL YEARS
• • - • &
A-7492