Aggregate comparisons

You set two things. The Scope names the group the figure is drawn from — Market or Sector. The Aggregate sets how that group is summarised into one number:

• Index — the index-level figure for the chosen scope.
• Average — the mean across the group.
• Median — the middle value of the group.
• 75th percentile — the value three-quarters of the way up the group.
• 25th percentile — the value one-quarter of the way up the group.

The filter then keeps instruments above or below that figure, according to the direction you set. Because the reference is a population statistic, the pass/fail line moves with the group as data updates, unlike a fixed value that stays put.

It is not the same thing as the Market & Sector filter category: those filters read a market or sector figure instead of the instrument's, while an aggregate comparison reads the instrument's own metric and only borrows a market or sector figure as the threshold (see filter taxonomy).

A screener over technology stocks adds a Price/Earnings filter in vs Aggregate mode, sets Scope = Sector and Aggregate = Median, and keeps instruments below that figure. The filter now passes only technology names whose P/E sits under the sector's median P/E — a peer-relative screen that shifts as valuations move, where a fixed P/E < 15 would not.