You can also compare two records on many attributes. For two records to match, the two
following conditions must hold:

• When using the T-Swoosh algorithm, the score for each matching function in the
  match rule must exceed the threshold, if any specified. By default, the
  threshold is set to 1. This means exact match for most
  matching functions, excepted for Exact – ignore case and
  potentially any custom matching function.

• The global score, computed as a weighted score of the different matching
  functions, must exceed the match threshold. The score is equal to
  Σ(w_i ×
  s_i(r₁,r₂)) / Σw_i where
  w_i is the confidence
  weight of the matching function i and
  s_i(r₁,r₂)
  is the score of the matching function i over
  records r₁ and
  r₂.

In this example, the score for the Levenshtein metric on the
attribute country must exceed 0.7 and
the global score, with a confidence weight of 1 on each of
the two measures, must exceed 0.85.

This example shows the weighted average computation that yields the global score of
two similar records.