| Name | Description | Type | Package | Framework |
| Normalization | This class acts as the base class for the implementations of the term frequency normalization methods in the DFR framework. | Class | org.apache.lucene.search.similarities | Apache Lucene |
| Normalization .NoNormalization | Class | org.apache.lucene.search.similarities.Normalization | Apache Lucene | |
| NormalizationH1 | Normalization model that assumes a uniform distribution of the term frequency. | Class | org.apache.lucene.search.similarities | Apache Lucene |
| NormalizationH2 | Normalization model in which the term frequency is inversely related to the While this model is parameterless in the | Class | org.apache.lucene.search.similarities | Apache Lucene |
| NormalizationH3 | Dirichlet Priors normalizationWARNING: This API is experimental and might change in incompatible ways in the next release. | Class | org.apache.lucene.search.similarities | Apache Lucene |
| NormalizationZ | Pareto-Zipf NormalizationWARNING: This API is experimental and might change in incompatible ways in the next release. | Class | org.apache.lucene.search.similarities | Apache Lucene |