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.
TABLE VII CHI SQUARE TEST OF KNOWNS VERSUS UNKNOWNS ON THE BASIS OF LIGHT BRIGHTNESS Light Brightness Number of KNOWNS Adjusted Number of KNOWNS(K) Number of UNKNOWNS(n) X2(K-n)2/K Sunlight on mirror 47 11 14 0.82 Sunlight on aluminum 151 37 28 2.19 Sunlight on plaster,stone,or soil 76 19 16 0.47 Brighter than moon 273 67 61 0.55 Like moon or duller than moon 68 17 22 1.47 Not stated 1150 283 293 0.35 Total 1765 434 434 5.85 Degrees of freedom 5 5% 11.1 1% 15.1
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.