# phpman > man > Plucene::Search::Similarity(3pm)

## NAME
    [Plucene::Search::Similarity](https://www.chedong.com/phpMan.php/perldoc/Plucene%3A%3ASearch%3A%3ASimilarity/markdown) - the score of a query

## DESCRIPTION
    The score of a query for a given document.

## METHODS
  norm
            my $norm = $sim->norm($num_term);

  byte_norm
            my $byte_norm = $sim->byte_norm($byte);

  tf
    Computes a score factor based on a term or phrase's frequency in a document.

  idf
    Computes a score factor for a phrase.

  coord
    Computes a score factor based on the fraction of all query terms that a document contains.