Abstract
This article investigates the probability distribution of discourse relations with respect to the categories of the rhetorical structure theory (RST). Twenty texts were randomly extracted from a Chinese RST-style discourse corpus, and the frequency distribution of different discourse relations was investigated. Results show that all the RST relations in all the 20 texts fit perfectly well with a modified right-truncated Zipf-Alekseev distribution. The investigation verifies that at discourse level, linguistic development also follows the diversification process.
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