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. 2010 Mar 19;5(3):e9506. doi: 10.1371/journal.pone.0009506

Figure 5. Bigram probability P(b|a) for a random distribution with no correlations amongst the signs (above) and for the EBUDS corpus (below).

Figure 5

Horizontal lines in the upper matrix imply that the conditional probability of a sign b following a sign a is equal to probability of sign b itself. The bigram probability P(b|a) after Witten-Bell smoothing is shown in the lower plot. The difference between the two matrices indicates the presence of correlations in the texts.