# Document frequency of phrases
**URL:** https://discuss.elastic.co/t/document-frequency-of-phrases/21104
**Category:** Elasticsearch
**Created:** [December 5, 2014, 12:35pm UTC](https://discuss.elastic.co/t/document-frequency-of-phrases/21104 "2014-12-05T12:35:09Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@Yingkai\_Gao\_2](https://discuss.elastic.co/u/Yingkai_Gao_2)
#### Post date: [December 5, 2014, 12:35pm UTC](https://discuss.elastic.co/t/document-frequency-of-phrases/21104/1 "2014-12-05T12:35:09Z")
I am implementing a model called sequential dependency model in
ElasticSearch using dynamic script, and I need to get the collection
frequency (shard frequency in ES) of a phrase. It is possible to get the
term frequency of phrase by comparing the positions of each term in the
phrase, but how could I get collection frequency or document frequency of
phrases? If it is possible, how could I get the collection frequency of
two sloppy near terms?
I guess one solution is to extend a Lucene similarity class. However, can
I do this just using dynamic script?
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 6, 2017, 12:45am UTC](https://discuss.elastic.co/t/document-frequency-of-phrases/21104/2 "2017-07-06T00:45:34Z")