Your Average Rating score is an average of the actual star ratings given by users of the various review sites. Sentiment Trend is a group rating based on 3 types of groups: 1) Positive sentiments are 4 and 5 star reviews, 2) neutral sentiments are 3 stars, and 3) negative sentiments are 1 and 2 star reviews. Displaying it this way provides an overall sentiment of all reviews, positive, neutral or negative.