plotTopic: Plotting Counts of Topics over Time (Relative to Corpus)

In tosca: Tools for Statistical Content Analysis

Plotting Counts of Topics over Time (Relative to Corpus)

Description

Creates a plot of the counts/proportion of specified topics of a result of LDAgen. There is an option to plot all curves in one plot or to create one plot for every curve (see pages). In addition the plots can be written to a pdf by setting file.

Usage

plotTopic(
  object,
  ldaresult,
  ldaID,
  select = 1:nrow(ldaresult$document_sums),
  tnames,
  rel = FALSE,
  mark = TRUE,
  unit = "month",
  curves = c("exact", "smooth", "both"),
  smooth = 0.05,
  main,
  xlab,
  ylim,
  ylab,
  both.lwd,
  both.lty,
  col,
  legend = ifelse(pages, "onlyLast:topright", "topright"),
  pages = FALSE,
  natozero = TRUE,
  file,
  ...
)

Arguments

object	textmeta object with strictly tokenized text component (character vectors) - such as a result of cleanTexts
ldaresult	The result of a function call LDAgen
ldaID	Character vector of IDs of the documents in ldaresult
select	Integer: Which topics of ldaresult should be plotted (default: all topics)?
tnames	Character vector of same length as select - labels for the topics (default are the first returned words of top.topic.words from the lda package for each topic)
rel	Logical: Should counts (FALSE) or proportion (TRUE) be plotted (default: FALSE)?
mark	Logical: Should years be marked by vertical lines (default: TRUE)?
unit	Character: To which unit should dates be floored (default: "month")? Other possible units are "bimonth", "quarter", "season", "halfyear", "year", for more units see round_date
curves	Character: Should "exact", "smooth" curve or "both" be plotted (default: "exact")?
smooth	Numeric: Smoothing parameter which is handed over to lowess as f (default: 0.05)
main	Character: Graphical parameter
xlab	Character: Graphical parameter
ylim	Graphical parameter
ylab	Character: Graphical parameter
both.lwd	Graphical parameter for smoothed values if curves = "both"
both.lty	Graphical parameter for smoothed values if curves = "both"
col	Graphical parameter, could be a vector. If curves = "both" the function will for every topicgroup plot at first the exact and then the smoothed curve - this is important for your col order.
legend	Character: Value(s) to specify the legend coordinates (default: "topright", "onlyLast:topright" for pages = TRUE respectively). If "none" no legend is plotted.
pages	Logical: Should all curves be plotted in a single plot (default: FALSE)? In addtion you could set legend = "onlyLast:<argument>" with <argument> as a character legend argument for only plotting a legend on the last plot of set.
natozero	Logical: Should NAs be coerced to zeros (default: TRUE)? Only has effect if rel = TRUE.
file	Character: File path if a pdf should be created
...	Additional graphical parameters

Value

A plot. Invisible: A dataframe with columns date and tnames with the counts/proportion of the selected topics.

Examples

## Not run: 
data(politics)
poliClean <- cleanTexts(politics)
words10 <- makeWordlist(text=poliClean$text)
words10 <- words10$words[words10$wordtable > 10]
poliLDA <- LDAprep(text=poliClean$text, vocab=words10)
LDAresult <- LDAgen(documents=poliLDA, K=10, vocab=words10)

# plot all topics
plotTopic(object=poliClean, ldaresult=LDAresult, ldaID=names(poliLDA))

# plot special topics
plotTopic(object=poliClean, ldaresult=LDAresult, ldaID=names(poliLDA), select=c(1,4))

## End(Not run)

tosca documentation built on June 8, 2025, 11:21 a.m.