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.
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1 Enliiation r> Balloon I-Astionomial 2-Aucrartt ^Li^ht Ptitnom. 4-Birrts S-Clouos, Dust, etc 6-lnsufiic kifo. 7-Psvcholo|ical S-Unkttnm »>Otner Total r A? 73 flu fS-2 >er Cent Doubtful J2J2 \jp.0 \J2J2~ 4? 4f Total 0 0 0O 00 2*S 4f U3 2U Aaa if )ertain / 0 2. \ / ~ 0 0 P AAJIU Number Doubttull Vf 2, Z 0 0 0 0_ Total ^ 2. 2. 0 0 y—0- f Per Cent Certain 9/ A2JZ- #0 %' A£L 0.A? 9A £0 Certain 2. 0 a 0 4 0 z 0 Number TloubtfuT 0 0 r o j2_ f I Total 2 0 0 0 0 4 A? 2* 22- PerCent Certain 9 A f.0 ft-4 0 0 0.0 A $2. 00 22J t/6 90-9 Doubtful 00 0 0 4s 0 0 0 0 0.0 0.0 0.0 0.0 4s- f,r ToUl 9/ 0 0 Y&9 A?O 0.0 O.0 /$2 0.0 22.-/ 9.0 (00. A?gA Number Certain 0 / 0 0 / J / Doubtful a a 0 & a & s Totall 0 4 A? 0 A 0 3 j /p Pet Cent Certain 0.0 A0-0 A0.0 0.0 0 0 A0.0 0.0 Sao too 70.0 Doubtful 4 0 10.0 0.0 0 0 0 0 0.0 0 0 0.0 0.0 30-0 ToUi 0. 0 4l9.0 A00 0.0 0 0 yap. 0.0 ^&& /£}, £ AfS2' Number Certain A0 J 23 g (50 Doubtful f 7 0 0 / Total — ^ A0 9 A? 21 i ^ 5 7 9 2O3 Percent Certain 4.9 AS- ifi.l 2.0 2.0 00 0.0 tf.O .79 Doubtful 44 •f-Y AA3 jr.O 2 ? 0.0 A-0 0 5 2t, / Total 7-2 7'/0/V 0F A//l/A7~ SA&A/7~/Al/C> S At9l? /*)i.L V^/fjf^ /&V I ! Evaluation 0- Balloon l-Astranormcal 2-Aircratt 3 - L I J H I Phenoa. 4- Buds 5-Clouds, Dust, etc &-lnsuffic kifo. 7-PsycholO|icai S-Urunmn 9-ODier Total * AIAC . Number Certain ' / 4 0 /d j 12. 5 &S Doubtful / 0\ 0 / a. i L Total 2. f 3 s 0 10 4 32. 19 Per Cent Certain A3 J 2 J.S 5/ 0.0 /2-1 S.i 4P.S i.3 $2.3 Doubtful /•3 S~A 7-6 0.0 A-S 0.0 0.0 /.-? 0(? A3 rr.7 Total 2. A, (P.Z If**1 6-4 0.O (2-7 4o.s iff Ceitain 0 0 0 p 0 d? 0 A 5" A 0.0 77 O.o 0.0 20$ 77 MS. 77 (OIL- Evaluation 0- Balloon lAslronoaial 2-Aircratt J-Litht Pneno*. 4-Bnds S-Clouds, Dust, etc 6-lMuflic k b . 7-PjrdBloral 1-IHiDnii Mow Total /9S-0 Number Certain 0 7 a A? 0 0 A 0 2. Doubtful 0 £? 0 (7 0 o 0 _ £ _ 0 Total 0 A 0 0 A? 0 0 0 / 0 z. PeiCent Certain 0 0 500 J2& 00 A).0 00 0.0 0.9 &J2- ao lOOi Doubtful 0 0 A?-0 0.O 0.O AOO. Nuarbei Certain 0 a 0 0 0 / A? 2, A 4 Doubtful 0 0 0 A 0 o o o0 / Total 0 0 0 0 / 0 / 0 2. / P e r c e n t Certain 0.0 A).ry 0.O 0.0 ZA2JL 0.0 Vo.o 20.0 Doubtful J2J2. (?lP ao A?,0 20.0 0.0 0-0 0 0 0.O (?..O mo Total (?-0 fi.'n (?•(? nv0-0 ?0O 0.0 ft>.o ZO. 0 /GO. A95-2, Nunbei ;ertain —A, I 2. ? 2. 0 0 20 & Doubtful ^ 0 0 0 0 0 L_ 0 A A0 ToUl 2, i> 7 3 2 (? 40 00 3 47 Per Cent Certain J>/ £.4 4.3 t.4 0.0 t.s 00 .C IO0. Number Certain Doubtful ToUl PerCenl Certain Doubtful Total 148
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