Grouping and dependency theories.

David G. Hays

ResearchPublished 1960

A comparison of two theories of sentence structure. One theory groups words into phrases, and phrases into larger phrases, until each complete sentence is grouped into a single unit. The other treats connections between words, making the whole structure of each sentence into a "tree," resembling an organization chart. The study shows that results obtained by the two theories are similar but not identical: for a given grouping, several trees are possible, and vice versa. Since RAND is almost the sole proponent of the tree theory, the similarities and differences between what RAND and others are doing are emphasized.

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Hays, David G., Grouping and dependency theories. Santa Monica, CA: RAND Corporation, 1960. https://www.rand.org/pubs/research_memoranda/RM2646.html.
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