dtm_compare: Compare two document term matrices

In corpustools: Managing, Querying and Analyzing Tokenized Text

Compare two document term matrices

Description

Compare two document term matrices

Usage

dtm_compare(
  dtm.x,
  dtm.y = NULL,
  smooth = 0.1,
  min_ratio = NULL,
  min_chi2 = NULL,
  select_rows = NULL,
  yates_cor = c("auto", "yes", "no"),
  x_is_subset = F,
  what = c("freq", "docfreq", "cooccurrence")
)

Arguments

dtm.x	the main document-term matrix
dtm.y	the 'reference' document-term matrix
smooth	Laplace smoothing is used for the calculation of the probabilities. Here you can set the added (pseuocount) value.
min_ratio	threshold for the ratio value, which is the ratio of the relative frequency of a term in dtm.x and dtm.y
min_chi2	threshold for the chi^2 value
select_rows	Alternative to using dtm.y. Has to be a vector with rownames, by which
yates_cor	mode for using yates correctsion in the chi^2 calculation. Can be turned on ("yes") or off ("no"), or set to "auto", in which case cochrans rule is used to determine whether yates' correction is used.
x_is_subset	Specify whether dtm.x is a subset of dtm.y. In this case, the term frequencies of dtm.x will be subtracted from the term frequencies in dtm.y
what	choose whether to compare the frequency ("freq") of terms, or the document frequency ("docfreq"). This also affects how chi^2 is calculated, comparing either freq relative to vocabulary size or docfreq relative to corpus size (N)

Value

A data frame with rows corresponding to the terms in dtm and the statistics in the columns

corpustools documentation built on May 31, 2023, 8:45 p.m.