Fitting Ranked English and Spanish Letter Frequency Distribution in U.S. and Mexican Presidential Speeches

Details Fitting Ranked English and Spanish Letter Frequency Distribution in U.S. and Mexican Presidential Speeches Fitting Ranked English and Spanish Letter Frequency Distribution in U.S. and Mexican Presidential Speeches

2011-03-15

arxiv.org/abs/1103.2950v1

Computer Science

Computation and Language

7 figures

Scientific paper

The limited range in its abscissa of ranked letter frequency distributions causes multiple functions to fit the observed distribution reasonably well. In order to critically compare various functions, we apply the statistical model selections on ten functions, using the texts of U.S. and Mexican presidential speeches in the last 1-2 centuries. Dispite minor switching of ranking order of certain letters during the temporal evolution for both datasets, the letter usage is generally stable. The best fitting function, judged by either least-square-error or by AIC/BIC model selection, is the Cocho/Beta function. We also use a novel method to discover clusters of letters by their observed-over-expected frequency ratios.

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