To focus on instances of interest to us, we restricted ourselves to a subset of the rating data associated with relatively heavy raters.
we formed the experimental dataset by randomly selecting 9,003 raters who provided at least 200 ratings (of which at least 10 were positive and 10 were negative), 189,291 authors who received at least 20 ratings, and 5,088 news articles that received at least 40 comments in the raw dataset during the three-month period.