Rosette can analyze the sentiment (subjective attitude) of the input as positive (pos), negative (neg), or neutral (neu). Given the input we return a sentiment label with a confidence score between 0 and 1.
When Rosette detects entities within your input, it also returns the sentiment for each unique entity in the document. It will group all of the relevant sentiment about that entity into one mention, identified by its entityID.
More info:
https://developer.rosette.com/features-and-functions#sentiment-analysis