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Project Blue Book Special Report (second copy)

Internet Archive · 309 pages · text from the file's own layer

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.

Open the PDF at page 81 Original source ↗

“ATIC”7 pages

  • p. 10 …consisting of both experts -within and outside ATIC. During the course of the work, guidance and…
  • p. 11 …The bulk of the data arrived at ATIC through regular military channels, from June, 1947, until…
  • p. 12 …Questionnaire The first reports received by ATIC varied widely in completeness and quality. Air Force Letter…
  • p. 13 …subjected to a trial test before adoption. ATIC sent a copy to observers reporting sightings, with…
  • p. 19 …Although representatives of ATIC participated in making the final identifications, it must be emphasized that any…
  • p. 21 …This work was done at ATIC, periodically, as reports became ready. During an identification conference, each…
  • p. 84 …Using all the UNKNOWNS reports available at ATIC, the panel made a careful study of the…
TABLE XI CHI SQUARE TEST OF REVISED KNOWNS VERSUS UNKNOWNS
ON THE BASIS OF DURATION OF OBSERVATION
Duration of
Observation
Number of
KNOWNS
Adjusted
Number of
KNOWNS (K)
Number of
UNKNOWNS (n)
X 2 ,
K
0.
1.
1.
3.
2.
2.
1.
0.
52
56
2 3
90
31
9 4
16
72
5 sec or less
6-10 sec
11.-30 sec
31-60 sec
61 sec-5 min
6 min-30 min
Over 30 min
Not stated
92
47
118
92
252
259
91
335
Total 1286
31
16
40
31
85
87
31
113
434
27
21
33
42
99
71
37
104
434 14. 34
Degrees of freedom
5%
1%
14. 1
18. 5
73
gfc :-•

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Report, cited by the archive. The PDF is mirrored here; the original link is under it. 309 pages are in the text index: search them above, or from the library's search.