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 IV CHI SQUARE TEST OF KNOWNS VERSUS UNKNOWNS ON THE BASIS OF SHAPE Shape Number of KNOWNS Adjusted Number of KNOWNS(K) Number of UNKNOWNS(n) X2,(K-n)2/K Elliptical 838 206 195 0.59 Rocket and aircraft 80 20 33 8.45 Meteor or comet 55 14 4 7.14 Teardrop, lenticular, or conical 103 25 22 0.36 Flame 96 24 10 8.17 Other 193 47 54 1.04 Not stated 400 98 116 3.30 Total 1765 434 434 29.05 Degrees of freedom 6 5% 12.6 1% 16.8
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.