Sentiment percentages are calculated within the context of the selected breakdown, such as referrers and time period. For any given time period, the sentiment percentages across all selected referrers add up to 100%. The same is true for the total time period overall.
Because the report shows sentiment split by both referrer and time, the percentages are not meant to be added across individual rows or categories – only across the full set of referrers for the same time period.
