The wonderful wizard of NRC

Last but not least, you get to work with the NRC lexicon which labels words across multiple emotional states. Remember Plutchik's wheel of emotion? The NRC lexicon tags words according to Plutchik's 8 emotions plus positive/negative.

In this exercise there is a new operator, %in%, which matches a vector to another. In the code below %in% will return FALSE, FALSE, TRUE. This is because within some_vec, 1 and 2 are not found within some_other_vector but 3 is found and returns TRUE. The %in% is useful to find matches.

some_vec <- c(1, 2, 3)
some_other_vector <- c(3, "a", "b")
some_vec %in% some_other_vector

Another new operator is !. For logical conditions, adding ! will inverse the result. In the above example, the FALSE, FALSE, TRUE will become TRUE, TRUE, FALSE. Using it in concert with %in% will inverse the response and is good for removing items that are matched.

!some_vec %in% some_other_vector

We've created oz which is the tidy version of The Wizard of Oz along with nrc containing the "NRC" lexicon with renamed columns.

Diese Übung ist Teil des Kurses

Sentiment Analysis in R

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Interaktive Übung

Versuche dich an dieser Übung, indem du diesen Beispielcode vervollständigst.

oz_plutchik <- oz %>% 
  # Join to nrc lexicon by term = word
  inner_join(___, by = ___("___" = "___")) %>% 
  # Only consider Plutchik sentiments
  ___(!___ %in% c("___", "___")) %>%
  # Group by sentiment
  ___(___) %>% 
  # Get total count by sentiment
  ___(total_count = ___(___))

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