compare-method: compare features

In nrauscher/corpus: Toolkit for Corpus Analysis

Description

The features of two objects, usually a partition defining a corpus of interest, and a partition defining a reference corpus are compared. The most important purpose is term extraction.

Usage

## S4 method for signature 'partition'
compare(x, y, included = FALSE, method = "chisquare",
  verbose = FALSE)

## S4 method for signature 'partitionBundle'
compare(x, y, included = FALSE,
  method = "chisquare", verbose = TRUE, mc = getOption("polmineR.mc"),
  progress = FALSE)

## S4 method for signature 'cooccurrences'
compare(x, y, included = FALSE, method = "ll",
  mc = TRUE, verbose = TRUE)

## S4 method for signature 'ngrams'
compare(x, y, included = FALSE, method = "chisquare",
  verbose = TRUE, ...)

Arguments

x	a partition or partitionBundle object
y	a partition object, it is assumed that the coi is a subcorpus of ref
included	TRUE if coi is part of ref, defaults to FALSE
method	the statistical test to apply (chisquare or log likelihood)
verbose	logical, defaults to TRUE
mc	logical, whether to use multicore
progress	logical
...	further parameters

Value

The function returns a data frame with the following structure: - absolute frequencies in the first row - ...

Author(s)

Andreas Blaette

References

Manning / Schuetze ...

Examples

## Not run: 
  use(polmineR.sampleCorpus)
  kauder <- partition("PLPRBTTXT", text_name="Volker Kauder", pAttribute="word")
  all <- partition("PLPRBTTXT", text_date=".*", regex=TRUE, pAttribute="word")
  terms_kauder <- compare(kauder, all, included=TRUE)
  top100 <- subset(terms_kauder, rank_chisquare <= 100)

## End(Not run)
## Not run: 
  use(polmineR.sampleCorpus)
  byName <- partitionBundle("PLPRBTTXT", sAttribute="text_name")
  byName <- enrich(byName, pAttribute="word")
  all <- partition("PLPRBTTXT", text_date=".*", regex=TRUE, pAttribute="word")
  result <- compare(byName, all, included=TRUE, progress=TRUE)
  dtm <- as.DocumentTermMatrix(result, col="chisquare")

## End(Not run)

nrauscher/corpus documentation built on May 23, 2019, 9:34 p.m.