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 II CHI SQUARE TEST OF KNOWNS VERSUS UNKNOWNS ON THE BASIS OF COLOR Color Number of KNOWNS Adjusted Number of KNOWNS(K) Number of UNKNOWNS(n) X2(K-n)2/K White 405 100 112 1.44 Metallic 313 77 76 0.01 Not stated 209 51 62 2.37 Orange 172 42 49 1.17 Red 146 36 33 0.25 Yellow 128 31 31 0 Green 130 32 14 10.13 Blue 67 17 26 4.76 Other 195 48 31 6.02 Total 1765 434 434 26.15 Degrees of freedom 8 5% 15.5 1% 20.1
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.