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See also: Silence (homonymy)

and

See also: Noise

Silence

In the Information sciences and libraries, one speaks about silence when relevant answers are not proposed by the system of interrogation of the Database, whereas they exist. That can arrive in particular with the catalogs of library. The causes of silence can be multiple:

  • the user Formula One a request including/understanding too many terms coordinated by and
  • the Indexation of the base is insufficient
  • the indexing of the base follows a rigid and complicated language that does not know the user (example: indexing and research to leave only a Thesaurus)

That is to say a unit NR of documents, has is a subset of NR and comprises the relevant answers for the search for a user, B is the subset of NR made up of the answers obtained. The more has is higher than B, the larger silence is and the rate of Rappel is weak.

Noise

In the library and information sciences, one speaks about noise when not-relevant answers are proposed by the system of interrogation of the database. These answers are frays with relevant answers but these last are likely not to be seen by the user. That can arrive in particular with the catalogs of library. The causes of the noise can be multiple:

  • the user does not use enough terms in its request
  • the user Formula One a request including/understanding too many terms coordinated by or

That is to say a unit NR of documents, has is a subset of NR and comprises the relevant answers for the search for a user, B is the subset of NR made up of the answers obtained. The more has is lower than B, the larger the noise is and the rate of precision is weak.

It should be noted that on same a Requête one can meet noise and silence. interesting Documents are badly indexed (silence) and of the useless documents answer the equation of research. If a user types Viking, the documents indexed with the word Normands will not appear (silence) and some speaking about the space probes will appear (noise).

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