Documents / Report
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.
“R.G.”3 pages
Evaluation O-Balloon l-Astronomical 2-Aucraft 3-Light Phenoni. 4-Birds 5-Clouds, Dust, etc 6-lnsuffic Info. 7-Psvctolo|ial eVUnknom 9-Other Total Evaluation O-Balloon 1-Astranomical 2-Aircraft 3-Ltght Phenom. 4-Birds 5-Clouds, Dust, etc 6-lnsuffic. Info. 7-Psychological 8-Unknonn 9-0 tiler Total -T/>jg(. - £ • ; ?£?£> ALL YESRS Number Certain _ ^ > •J"? /O 0 J ' 73 /3/S YFA/T'S Per Cent Certain / , IJLi. 1.3 o.d. 0.' £L3j UA £o_ 717 Doubtfu 4-2 /A J 3 7 a.9 0.2 0O / 4 AS. 3 Total /£-£. h »' j 2 / o /££. /1 /T(f f4 /g0 s \/ foe >er Cent Doubtful O.O o.o O.O o.o 0.0 O.O o.o o.o o.o o.o O.o Total /fiC.O O.O 0.O O-O -&°_eo a.o /DO. /9 J-/ Certain 0 _J_\ 0 O 0 o / 0 / //try Number Doubtful O 3 o 0 O , o o o o o 3 0/V Total 0 c 0 o o / £> ,2 ; 'ft Number Certain 1 / 0 0 ;/ JL So Doubtful 0 0 o 0 o 0 0 c? o Total / 1 c o // lo fa. Percent Certain &£-. .e _0O\ 0.O 0.0 /o o 0.0 fo.0 2*60. /i Certain JdL J0 £$- O.0 &£- A2.L 3.S 7.7 9Lx Doubtful 0.0 Ao.o O.o 0.O o.o o.o @ & & & 0.0 0.O 3o.o PerCent Doubtful e>.o U 0 O o.o o.o o.o O.O O.O o.o o.o u Total £>o io.o O.o O.o 0.0 /0o O.o J0.O /OO /OO. S~/6 Total 3-t 4oi /.a / • * 0.O o.o 3/./ 3.9 1.7 /OO. '&0t >K£ /94-t Number Certain 0 0 0 0 o 3 o a Doubtful O 7 o O o 0 o 0 O 7 Total 0 /3 0 6 e> 0 -0 o j o /£ Per Cent Certain o.t O,t 0.O •s.o O.O o.o 0.O /f.1 0.O Doubtful O.O 43,9 0 O a.o OO o.o o.o O.o 0.0 0.O 4i.$ Total O.O gu 0.0 J.O 0 o O.O o.o 0.0 /in 0.0 / /? J~A Number Certain 0 36, So £> / t 0 3 #0 //r/ Doubtful 0 / 6 0 / 0 0 /s Total 3 /A e I ci ( if Per Cent Certain i>.0 fen /O.i Oo o.o /o S.2 p o A24 j . l A Doubtful 11 J.o /•o o.o /•O O.O ff.O /S.4 /?LL '0r Total 4 1 41,1 o.o /•o /o /0 0.0 fi-o e.o *. / / / f't *}•? •erCent Doubtful 3-4 4.o 7-4. O.O O.O OO 0.0 0.0 0.0 / • * /£•' Total /Of /9-r O.o \-&£- O.O 2J.1 O.O /It 4o /OO. f?j~/ Number Certain / 0 0 / 3 Doubtful £ 4 z 0 o £? o o /7 jrotaTJ 4' 14 10 1 p /Z 1 AC 3 74- Certain 21 Si / • / 0.O 0.0 /(•A. / 4 &-. 1 4-1 77-0 aer Cent Doubtful /o.s J'4 l Total 93 /£4- /£° A4 s 4 /o /4A 40 7J4 Certain 1-A /Ll 0.7 o./ Ao It I 3-i' 1/-9 >er Cent Doubtful fA (2,f /•A 0.4 o£ o.o 0.4 0.0 / • ? All Total /A 6 2 j i J/X ,f-A /•I /J./ /•4 /tz ^4 (00. Number Certain Doubtful Total t Certain 'er Cent Doubtful Total 203
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