Inducción de un Lexicón de Opinión Orientado al Dominio

In this paper we explain the building of an English lexicon of adjectives and their semantic orientations. Rather than defining the semantic orientation of a term as a single value, we induce many real values representing the semantic orientation of that term being used in different domains. The automatic building of this resource has been based on the construction of graphs from conjunctive expressions between adjectives observed in a review corpus. A modified PageRank algorithm, adapted to be used with graphs with positive and negative edges, was applied to these graphs to obtain the values for the semantic orientation of terms. The method has been evaluated using Micro-WNOp, getting similar results or even better than those reported by some recent papers.