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.
•Tjft.^ 47/ ^1/4/.///}'770/1/ A?f ///i//. t/r/, VdS Eratatni O-Ballo- 1-AstmuudJ J-Aircrilt . K i * Pktm. «-8inh SOcKb, Owl itc (••tarthcMb. 7-Pirdelotal M M M M KWnr /III i s 23 2. 2, A? ? 2, // 1 rtain /2- 27 f / / / /3 / 2. V *r Percent Certain J2L 73 02 /2Z 00 JLI 0.0 /&•/ W Doubtful g.A (t.S. 3.2 00 0? 0.0 00 0.0 0.0 3.2 ?3? Total AZS /06 0$ A 6 0O / / / 00 s:c A0O. Number Certain -A0- 2g /$ L. g' 11- Doubtful 3 76 0 0 0 1 0 • 0 Total /J AOV 2A 0 0 0 2A / A? f (Iff Percent Certain $•¥ /s.z i'/ .0,4 /(•t PIHKML 4-Birrb K l o « b , Dnt, etc t - k a r f h c k k . r-PsycWofiol 1-IMlMMI HDttier Total /f^0 Number Certain —A2- -1±\ 0. 0 ^ J- Ooubtfu S ' f 9 0 0 0 0 0 f 31 Total 2V 57 1,7 0 0 0 £/ 3? 7 A7L Percent Certain /A0 22/ AO.€ 00 0.0 00 /2.2- 71 111. A 7 79-A Doubtfu a* 0O 00 0.0 0.0 00 7.3 Total At? 33.Z AS7 0.0 00 00 /2.2. A* /?•* A00> A?fA Number Certain 0 M-. AS- 2, 0 /0 3Z S ?v Doubtful s /A 7 0 A 0 2f Total /I 31 ?2- 3 0 /0 2, ?Z A'7 Percent Certain /7.A (2.1 0.0 US 0? 27.3 20.*/ Doubtful d 0 0? J.0 0-0 0.0 0? 0.0 00 Total to.3 26,* 0 fl 00 A? 27$ V3 /0O. Nurober lertain A/S- 222- A7 & 3 /// 23 22/ 26 Doubtful / /•? fl-0 A!-g 1.D 40 Nuaber Certain Doubtfu Total PerCent Certain Doubtful Total # Evaluation O-Balloon - l-Astnmaical 2-Aircraft 3-Lilflt PtWKM. 4-Binh W l o w h , D n t , e»c t-msatTic. h h . 7-PiycWo|ica1 S-Urtoow 9-Othef Total f/?4UF A'71, Number Certain _/£, ~7 ^ / _O /%> ? , Number Certain / J 2 0 0 0 0 0 2 Doubtfu A. Total / / / 0 0 0 0 0 2 0 Certan 7-A 2A-V t 0.0 0.0 A?-0 0.0 0.0 /V-3 0 0 A00, Evaluabon lo-Bllloon : 1-Aslrpnofliical 2-Anciaft 3-Light Phenom. 4-Binb S-Clouds, Dust, etc t-lmuffic Inio. 7 - P i r d n l o r a l 1-lMnom W O * Total /?fe> Nunber Certain / l 1 I / f Doubtful 0 0 / 0 0 A) 0 0 /) 0 Total / 0 5 0 0 0 / 0 2. / -Ml. Per Cent Certain A0O 00 rf>0 00 0.0 /?O /0.0 00 20-0 /0.0 ?00 Doubtful 00 0.0 A00 A?0 0.£> 0.0 00 0-0 2.0 /0.0 Total f0.0 0.0 S0.0 00 00 SiO /0.0 00 200 /00 /0O. /??•/ Nurtier Certain _J2_ 0 0 0 0 _ £ , / A 2- Doubtful 0 O 0 0 0 0 0 0 0 0 0 Total a 0 p 0 0 0 r? 0 / A Percent Certain 00 J.0 0.0 00 &£- 00 O0-. 3>.O Doubtful 0-0 00 00 00 00 0.0 0.0 0-0 /Z0 0.0 00 Total 0.0 0O 0-4 00 00 0p 0O 0a &o 60a /?£2. Nunber M a i n Afr £ 3Z- f a 0 At 3 Ser f Doubtful 4 0 a 0 / 0 Total % fr7 0 0 A? 4 17? Per Cent Certain JLL. /./ /Z3 Z X 0.0 /O.3 A.7 2a. 0 *-9 Doubtful r-r 20.0 AA 0,0 0.0 0-0 flt 0.0 #0 3. Number Certain Doubtful Total Percent Certain Doubtful Total 1.47
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