10. An authoring assistant comprising: memory which stores a polar vocabulary in which a polarity measure is associated with each of a set of adjectival terms, the polarity measure being based on ratings of reviews in a corpus of reviews from which the respective adjectival term was extracted; a parser which identifies opinion expressions in text of an input author's review of an item, the review including the author's rating of the item on a predefined scale; an opinion review component which generates an analysis of the text of the author's review based on the identified opinion expressions, the opinion review component computing an effective opinion of the text as a function of a measure of polarity associated with the identified opinion expressions, which is based on the polarity measure associated with respective adjectival terms from the polar vocabulary that are in the opinion expressions, the opinion review component comprising a comparator component which compares the effective opinion with the author's rating associated with the text to determine whether the text and the author's rating of the item are coherent; a representation generator which generates a representation of the analysis for display on an associated user interface, the representation of the analysis including a representation of the effective opinion; a warning component which outputs a warning when the effective opinion and author's rating are incoherent; and a processor which implements the opinion review component and representation generator.
10. An authoring assistant comprising: memory which stores a polar vocabulary in which a polarity measure is associated with each of a set of adjectival terms, the polarity measure being based on ratings of reviews in a corpus of reviews from which the respective adjectival term was extracted; a parser which identifies opinion expressions in text of an input author's review of an item, the review including the author's rating of the item on a predefined scale; an opinion review component which generates an analysis of the text of the author's review based on the identified opinion expressions, the opinion review component computing an effective opinion of the text as a function of a measure of polarity associated with the identified opinion expressions, which is based on the polarity measure associated with respective adjectival terms from the polar vocabulary that are in the opinion expressions, the opinion review component comprising a comparator component which compares the effective opinion with the author's rating associated with the text to determine whether the text and the author's rating of the item are coherent; a representation generator which generates a representation of the analysis for display on an associated user interface, the representation of the analysis including a representation of the effective opinion; a warning component which outputs a warning when the effective opinion and author's rating are incoherent; and a processor which implements the opinion review component and representation generator. 11. The authoring assistant of claim 10 , further comprising a synonym generator for identifying synonyms of terms of identified opinion expressions, the representation generator displaying at least one synonym of one of the terms in an identified opinion expression when the effective opinion and the rating associated with the text are incoherent.