DotLucene 1.4 API Documentation |

# DefaultSimilarity.Idf Method

Implemented as `log(numDocs/(docFreq+1)) + 1`.

#### Overload List

Inherited from Similarity.

> public virtual float Idf(Term,Searcher);

Inherited from Similarity.

> public virtual float Idf(ICollection,Searcher);

Implemented as `log(numDocs/(docFreq+1)) + 1`.

> public override float Idf(int,int);

#### See Also

DefaultSimilarity Class | Lucene.Net.Search Namespace