## Uses of Class
org.apache.lucene.search.CollectionStatistics

Packages that use CollectionStatistics
org.apache.lucene.search: Code to search indices.
org.apache.lucene.search.similarities: This package contains the various ranking models that can be used in Lucene.

### Uses of CollectionStatistics in org.apache.lucene.search

Methods in org.apache.lucene.search that return CollectionStatistics
`CollectionStatistics` IndexSearcher.`collectionStatistics(String field)` Returns `CollectionStatistics` for a field, or `null` if the field does not exist (has no indexed terms) This can be overridden for example, to return a field's statistics across a distributed collection.

### Uses of CollectionStatistics in org.apache.lucene.search.similarities

Methods in org.apache.lucene.search.similarities with parameters of type CollectionStatistics
`protected float` BM25Similarity.`avgFieldLength(CollectionStatistics collectionStats)` The default implementation computes the average as `sumTotalTermFreq / docCount`
`protected void` LMSimilarity.`fillBasicStats(BasicStats stats, CollectionStatistics collectionStats, TermStatistics termStats)` Computes the collection probability of the current term in addition to the usual statistics.
`protected void` SimilarityBase.`fillBasicStats(BasicStats stats, CollectionStatistics collectionStats, TermStatistics termStats)` Fills all member fields defined in `BasicStats` in `stats`.
`Explanation` BM25Similarity.`idfExplain(CollectionStatistics collectionStats, TermStatistics termStats)` Computes a score factor for a simple term and returns an explanation for that score factor.
`Explanation` ClassicSimilarity.`idfExplain(CollectionStatistics collectionStats, TermStatistics termStats)`
`Explanation` TFIDFSimilarity.`idfExplain(CollectionStatistics collectionStats, TermStatistics termStats)` Computes a score factor for a simple term and returns an explanation for that score factor.
`Explanation` BM25Similarity.`idfExplain(CollectionStatistics collectionStats, TermStatistics[] termStats)` Computes a score factor for a phrase.
`Explanation` TFIDFSimilarity.`idfExplain(CollectionStatistics collectionStats, TermStatistics[] termStats)` Computes a score factor for a phrase.
`Similarity.SimScorer` BM25Similarity.`scorer(float boost, CollectionStatistics collectionStats, TermStatistics... termStats)`
`Similarity.SimScorer` BooleanSimilarity.`scorer(float boost, CollectionStatistics collectionStats, TermStatistics... termStats)`
`Similarity.SimScorer` PerFieldSimilarityWrapper.`scorer(float boost, CollectionStatistics collectionStats, TermStatistics... termStats)`
`abstract Similarity.SimScorer` Similarity.`scorer(float boost, CollectionStatistics collectionStats, TermStatistics... termStats)` Compute any collection-level weight (e.g.
`Similarity.SimScorer` SimilarityBase.`scorer(float boost, CollectionStatistics collectionStats, TermStatistics... termStats)`
`Similarity.SimScorer` TFIDFSimilarity.`scorer(float boost, CollectionStatistics collectionStats, TermStatistics... termStats)`
`Similarity.SimScorer` MultiSimilarity.`scorer(float boost, CollectionStatistics collectionStats, TermStatistics... termStats)`