quanteda (version 0.8.4-2)

docfreq: get the document frequency of a feature

Description

For a dfm-class object, returns the number of documents in which a feature in occurs greater than a given frequency threshold. The default is greater than zero, meaning that a feature occurs at least once in a document.

Usage

docfreq(object, threshold = 0)
## S3 method for class 'dfmDense,numeric':
docfreq(object, threshold = 0)
## S3 method for class 'dfmDense,missing':
docfreq(object, threshold = 0)
## S3 method for class 'dfmSparse,numeric':
docfreq(object, threshold = 0)
## S3 method for class 'dfmSparse,missing':
docfreq(object, threshold = 0)
## S3 method for class 'dfm,numeric':
docfreq(object, threshold = 0)
## S3 method for class 'dfm,missing':
docfreq(object, threshold = 0)

Arguments

object

a dfm-class document-feature matrix

threshold

numeric value of the threshold above which a feature will considered in the computation of document frequency. The default is 0, meaning that a feature's document frequency will be the number of documents in which it occurs greater than zero tim

Value

• a numeric vector of document frequencies for each feature

Examples

mydfm <- dfm(inaugTexts[1:2], verbose = FALSE)
docfreq(mydfm[, 1:20])