Documents / FOIA release
This CIA-released copy of Project Blue Book Special Report No. 14 is dated 5 May 1955 and comes from the Air Technical Intelligence Center at Wright-Patterson Air Force Base. It is a statistical analysis of about 4,000 unidentified aerial object reports from 1947 through 1952, coded onto IBM punched cards with the help of a panel of scientists. The report concludes that such objects were highly unlikely to be technological developments beyond present-day scientific knowledge. It also found no valid evidence of physical matter.
“Harder”1 page
Read from the scan by GLM-OCR; expect the odd misread word.
Group 5 - Night sightings for which the sun was more than $ 1 0^{\circ} $ below the horizon and which were not included in Group 4.
Group 6 - Sunrise sightings for which the sun was between $ 0^{\circ} $ and $ 1 0^{\circ} $ below the horizon.
Group 7 - Sunrise sightings for which the sun was between $ 0^{\circ} $ and $ 1 0^{\circ} $ above the horizon.
These group numbers were punched on the cards and incorporated into the coding system. The number of OBJECT SIGHTINGS in each group for each identification was then tabulated and is given in Table I.
TABLE I OBJECT SIGHTINGS
Angle of Elevation Group
Identification 1 2 3 4 5 6 7
Balloon 156 17 28 83 40 0 2
Astronomical 52 6 43 236 118 9 6
Aircraft 187 23 49 144 60 5 2
Light phenomena 8 2 4 25 7 0 0
Insufficient information 72 12 26 76 28 2 0
UNKNOWN 134 14 25 150 86 6 7
Other 64 8 12 50 36 3 7
Total 673 82 187 764 375 25 24
According to this table, a large majority of the KNOWN OBJECT SIGHTINGS in Group 1 (343 out of 467) were either aircraft or balloons. In Groups 4 and 5 combined, a large majority (681 out of 899) were either balloons, aircraft, or astronomical. Accordingly, a re-evaluation of the UNKNOWNS in these three groups was planned with the objective of determining which of the UNKNOWNS in Group 1 might possibly be aircraft or balloons and which of the UNKNOWNS in Groups 4 and 5 might possibly be balloons, aircraft, or astronomical objects. More will be said of this project later.
## Statistical Chi Square Test
In the meantime, mirror graphs had been constructed from the frequency tabulations which seemed to show that, when the KNOWNS (total less UNKNOWNS) and the UNKNOWNS were grouped according to one of six characteristics, the percentage of KNOWNS and the percentage of FOIA release, from the cia-readingroom collection. The PDF is mirrored here; the original link is above. The text was read from the page images by GLM-OCR; expect the odd misread word. 312 pages are in the text index: search them above, or from the library's search.