For a multi-covariate (crossed) content model, recovers the topic-word labels for each level of a single content covariate, averaging the crossed topic-word distributions over the other covariate(s). Lets you read off how topics' vocabulary shifts with one covariate while marginalizing the rest.
Usage
content_topics(model, by = NULL, n = 7L, type = c("prob", "lift", "frex"))