JSTOR_1bigram: Plot the frequency of one bigram over time in a JSTOR DfR dataset
Description
Function to plot changes in the relative frequency of a bigram over time. The relative frequency is the frequency of the bigram in a document divided by the total number of bigrams in a document. For use with JSTOR's Data for Research datasets (http://dfr.jstor.org/).
Usage
JSTOR_1bigram(unpack2grams, bigram, span = 0.4)
Arguments
unpack2grams
object returned by the function JSTOR_unpack2grams.
bigram
two words, surrounded by standard quote marks, or a vector of bigrams.
span
span of the lowess line (controls the degree of smoothing). Default is 0.4
Value
Returns a ggplot object with publication year on the horizontal axis and log relative frequency on the vertical axis. Each point represents a single document.