A method for checking similarities or differences between texts.
For similarities, defaults to "correlation" method.
Other methods for similarities include "cosine", "jaccard", "ejaccard",
"dice", "edice", "simple matching", and "hamann".
For differences, defaults to "euclidean".
Other methods for differences include "manhattan", "maximum",
"canberra", and "minkowski".
For more information on each of these methods and what are the implications
in selecting a method, please see `?quanteda.textstats::textstat_simil()`.