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It was from frequency analysis lecture and the professor mentioned but I cannot recall. The K value for English was .067, German was .076. The lowest K was Russian which was .056. When the frequency is uniform among 26 letters, then K is .038. What is the complete word that K stands for?

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It probably refers to the Index of coincidence, or more accurately the un-normalized index of coincidence, referred to in the Wikipedia article as "kappa-plaintext".

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  • $\begingroup$ Thanks! So do you mean it is probably from kappa? I am looking for a word than sounds beginning with K and mean something like I mentioned above. $\endgroup$
    – Kane
    Feb 5, 2015 at 1:07
  • $\begingroup$ Yeah, I would guess that K stands for kappa in this instance. $\endgroup$
    – JohnDvorak
    Feb 5, 2015 at 1:34

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