6. Apparatus for analyzing text having words from a plurality of language sources according to claim 5 wherein each letter sequence probability of occurrence signal generating means comprises means for forming a signal representative of the conditional probability of the occurrence of the last letter of said sequence given the occurrence of the other letters of said sequence.
6. Apparatus for analyzing text having words from a plurality of language sources according to claim 5 wherein each letter sequence probability of occurrence signal generating means comprises means for forming a signal representative of the conditional probability of the occurrence of the last letter of said sequence given the occurrence of the other letters of said sequence. 7. Apparatus for analyzing text having words from a plurality of language sources according to claim 6 wherein said word probability signal forming means further comprises: means responsive to said word probability of occurrence signals for the particular languages for generating a signal representative of the probability of the text word being in any one of said particular languages; means for dividing the signal representative of the probability of occurrence of said text word in said particular language by signal representative of the probability of the text word being in any one of said particular languages to form a probability estimate signal; and means responsive to the probability estimate signals for forming a signal representative of the confidence level of said probability estimate signal.