Returns the frequency of a word, ignoring any lower- or uppercase variants. The default value is False:

This value is usually greater than the default:

Find the frequency of a common Spanish word in a Spanish-language text corpus:

Spanish words might appear in the other languages, but with a much lower frequency:

A common word in French returns a high frequency value:

Popularity of the word "peace" in Spanish:

The word "Sputnik" in Russian:

Get a time series of the word "Haus" in German between 1900 and now and plot the result:

A word can have many lower- and uppercase variants:

Getting the frequency of the word with IgnoreCase->True should be equivalent to getting the Total for the previous list:

Get the most popular case variation of "DOS":

When asking for multiple words, the association will contain all variants of each word:

Calculate the frequency of a word in an specific year for all part of speech variants:

Show different usages of the word "nuke" in 1944:

Some words may return many part of speech variants:

Combining this argument with "CaseVariants":

Combining with "CaseVariants" and "TimeSeries":

Get the frequency of the word "war" throughout the twentieth century:

This can be plotted directly using DateListPlot:

Compare the usage of "peace" and "war" over time:

And compare their usage in another language too:

Plot the ratio of the words "war" and "peace" for both languages:

"Total" is the default property:

For a simple date range:

The usage of DateObject objects in the date specification is allowed:

The "Total" can be computed over a specific list of years:

Infinity can be used to specify an unbound range: