Project Blue Book Special Report (second copy)

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.

00
No. of object sightings
70 55 8 3 127 129 183 638 407 166 125 10,6 105
90
in
•= 80
7 0
o
§ 6 0
CO
.c
c 50
o
o 4 0
o
UJ
c
o
- w.
0)
a.
3 0
2 0
10
•a!
^
^
^
100
90
80
70
60
50
40
30
20
10
Jan Feb Mar Apr May June July Aug Sepf Oct Nov Dec
FIGURE 5 DISTRIBUTION OF OBJECT SIGHTINGS BY EVALUATION WITHIN MONTHS FOR ALL YEARS
A-7483