Keyness is also used to determine frequency profiling, i.e., the general ability to either distinguish one corpus from another based on the occurrence of keywords in each body or compare a sample corpus to a large or larger corpus. One application of frequency profiling would be to attribute material to a source, given a sufficient body of confirmed attributed material to reference; it could also be used to differentiate different “phases” in the writing or speech of one person. For example, researchers at Arizona State University used frequency profiling to demonstrate President Ronald Reagan’s cognitive decline before he was officially diagnosed with Alzheimer’s disease.

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