CIA STARGATE release
CIA-RDP96-00787R000200150006-0
Opens with: Attachment to ORD 2240-75
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3 pages, machine transcribed from the CIA’s released scan.
CONFIDENTIN · Approved For Release 2000/08/100 (01/FRDE:5-0010TR000200150006-0 Attachment to ORD 2240-75 Y_G Y_B Y_R G_B G-R B_R 900 850 800 750 Frequencies with which state transitions were observed. (r = . 93) CONFIDENTIAL CONFIDENTIAL Approved For Release 2000/08/10 : CIA-RDP96-00787R000200150006-0
Approved For Release 2000/08/10 : CIA-RDP96-00787R000200150006-0 988 passes). The results, shown in Table 3, indicate no significant 1 departure from random expectation during the successful run, and therefore, the significant result cannot be attributed to machine malfunction. At a later time, subject S2 was asked to repeat the entire exper- iment, and he was able to replicate successfully a high mean scoring rate (27.88/100 average over 2500 trials, a result whose a priori probability under the null hypothesis is p = 4.8x10 -4 ). We thus conclude from this part of the study that of the six sub- jects tested, one subject (S2) generated a significant result replicable and not attributable to machine malfunction. Finally, the study taken as a whole (15, 750 trials) was significant, yielding an average scoring rate 26.47 hits/100 trials, a result -5 whose a priori probability under the null hypothesis is p = 1.1x10 .. The bit rate associated with the information channel can be cal- culated from H. R = H (x) - H (x) , y where H(x) is the uncertainty of the source message containing symbols . with a priori probability P - i 4 H(x) = P i=1 P i log2 ₽4 i and H (x) is the conditional entropy based on the a posteriori pro- y ---- babilities that a received symbol was actually transmitted 4 y H (x) = - i,j=1 P(i,j) log, P . (j). Approved For Release 2000/08/10 : CIA-RDP96-00787R000200150006-0
Approved For Release 2000/08/10 : CIA-RDP96-00787R000200150006-0 For S2's first run, with P. = 1/4, P(k, k) = 0.2936, and an average of i 30 seconds per choice, we have a source uncertainty H (x) = 2 bits and a calculated bit rate R ≥ 0.007 bits/symbol ·or R/T ~ 2×10 -4 bits/sec. Approved For Release 2000/08/10 : CIA-RDP96-00787R000200150006-0