The textmodel virtual class is a parent class for more specific fitted text models,
which are the result of a quantitative text analysis applied to a document-feature
matrix.
xthe dfm on which the wordscores model was called
ysupervised labels (for supervised methods only)
callthe function call that fitted the model
methodthe type of textmodel, e.g. wordfish, wordscores, NB-
Available types currently include...