To avoid prevalence of personalised associations, annotators were told to only annotate polarity for subjective senses, as well as objective senses that carry a strong association likely to be shared by most people at least in Western culture (such as the negative polarity for words referring to diseases and crime).
our mapping from its phrase annotation to sentence annotation might be too coarse-grained as many sentences in the corpus span several clauses containing both opinions and factual description.