koRpus: lex.div.num – R documentation

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lex.div.num

Calculate lexical diversity

Description

This function is a stripped down version of lex.div. It does not analyze text, but takes the numbers of tokens and types directly to calculate measures for which this information is sufficient:

"TTR"The classic Type-Token Ratio
"C"Herdan's C
"R"Guiraud's Root TTR
"CTTR"Carroll's Corrected TTR
"U"Dugast's Uber Index
"S"Summer's index
"Maas" Maas' (a^2)

See lex.div for further details on the formulae.

Usage

lex.div.num(
  num.tokens,
  num.types,
  measure = c("TTR", "C", "R", "CTTR", "U", "S", "Maas"),
  log.base = 10,
  quiet = FALSE
)

Arguments

`num.tokens`	Numeric, the number of tokens.
`num.types`	Numeric, the number of types.
`measure`	A character vector defining the measures to calculate.
`log.base`	A numeric value defining the base of the logarithm. See `log` for details.
`quiet`	Logical. If `FALSE`, short status messages will be shown. `TRUE` will also suppress all potential warnings regarding the validation status of measures.

Value

An object of class kRp.TTR.

References

Maas, H.-D., (1972). \"Uber den Zusammenhang zwischen Wortschatzumfang und L\"ange eines Textes. Zeitschrift f\"ur Literaturwissenschaft und Linguistik, 2(8), 73–96.

Tweedie. F.J. & Baayen, R.H. (1998). How Variable May a Constant Be? Measures of Lexical Richness in Perspective. Computers and the Humanities, 32(5), 323–352.

Examples

lex.div.num(
  num.tokens=104,
  num.types=43
)

koRpus

Text Analysis with Emphasis on POS Tagging, Readability, and Lexical Diversity

v0.13-6

GPL (>= 3)

Authors

Meik Michalke [aut, cre], Earl Brown [ctb], Alberto Mirisola [ctb], Alexandre Brulet [ctb], Laura Hauser [ctb]

Initial release

2021-05-08