R.temis (version 0.1.3)

term_freq: term_freq

Description

Study frequencies of chosen terms in the corpus, among documents, or among levels of

Usage

term_freq(dtm, terms, variable = NULL, by_term = FALSE)

Arguments

dtm

A DocumentTermMatrix.

terms

One or more reference term(s) appearing in dtm.

variable

An optional vector of values giving the groups for which most frequent terms should be reported.

by_term

Whether the third dimension of the array should be terms instead of levels.

Value

A list of matrices, one for each level of the variable, with columns:

• "\ in documents where the chosen term is also present.

• "\ where the chosen term is also present (rather than in documents where it does not appear), i.e. the percent of cooccurrences for the term..

• "Global \ in the corpus (or in the subset of the corpus corresponding to the variable level).

• "Level": the number of cooccurrences of the term.

• "Global": the number of occurrences of the term in the corpus (or in the subset of the corpus corresponding to the variable level).

• "t value": the quantile of a normal distribution corresponding the probability "Prob.".

• "Prob.": the probability of observing such an extreme (high or low) number of occurrences of the term in documents where the chosen term is also present, under an hypergeometric distribution.

Examples

# NOT RUN {
file <- system.file("texts", "reut21578-factiva.xml", package="tm.plugin.factiva")
corpus <- import_corpus(file, "factiva", language="en")
dtm <- build_dtm(corpus)
term_freq(dtm, "barrel")
term_freq(dtm, "barrel", meta(corpus)$Date)

# }