# Package org.apache.solr.analytics.statistics

Statistics collectors reduce a list of Objects to a single value.

See: Description

- Interface Summary
  Interface | Description
  --- | ---
  StatsCollector | `StatsCollector` implementations reduce a list of Objects to a single value.

- Class Summary
  Class | Description
  --- | ---
  AbstractDelegatingStatsCollector | `AbstractDelegationStatsCollector` objects wrap other StatsCollectors.
  MedianStatsCollector | `MedianStatsCollector` computes the median.
  MinMaxStatsCollector | `MinMaxStatsCollector` computes the min, max, number of values and number of missing values.
  NumericStatsCollector | `NumericStatsCollector` computes the sum, sum of squares, mean and standard deviation.
  PercentileStatsCollector | `PercentileStatsCollector` computes a given list of percentiles.
  StatsCollectorSupplierFactory |
  UniqueStatsCollector | `UniqueValueCounter` computes the number of unique values.

## Package org.apache.solr.analytics.statistics Description

Statistics collectors reduce a list of Objects to a single value. Most implementations reduce a list to a statistic on that list.

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