Filter

Keep records matching simple/compound numeric, text, regex or Bradford criteria.

Filter

The Filter widget.

Overview

Subsets a corpus with one or more conditions:

  • numeric criteria (>, >=, <, <=, ==, !=, between) — e.g. Year ≥ 2015, Cited by ≥ 10;

  • text / keyword criteria (contains, not contains, equals, regex, in list);

  • combined with AND / OR.

It also offers a Bradford’s-law filter that keeps only documents published in the core zone — the few most productive sources that carry a third of the literature. Both the matching and the non-matching records are emitted, so the widget can also split a corpus in two.

Inputs

  • Data (Table).

Outputs

  • Matching Data (Table) — records satisfying the rules.

  • Non-matching Data (Table) — the complement.

Controls

  • Combine rules with — AND (all rules must hold) or OR (any rule).

  • Each rule — a column, an operator and a value; add/remove rows as needed.

  • Source column (Bradford) — the journal/source field used to build Bradford zones.

  • Number of zones (Bradford) — how many equal-citation zones to split sources into; the first zone is the kept core.

Actions: + rule / − rule (add/remove a condition), Apply filter.

Tips

  • The status line shows how many of the total records match.