opensearch-docs-cn/_aggregations/metric/extended-stats.md

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default	Extended stats	Metric aggregations	Aggregations	30	/query-dsl/aggregations/metric/extended-stats/

Extended stats aggregations

The extended_stats aggregation is an extended version of the stats aggregation. Apart from including basic stats, extended_stats also returns stats such as sum_of_squares, variance, and std_deviation. The following example returns extended stats for taxful_total_price:

GET opensearch_dashboards_sample_data_ecommerce/_search
{
  "size": 0,
  "aggs": {
    "extended_stats_taxful_total_price": {
      "extended_stats": {
        "field": "taxful_total_price"
      }
    }
  }
}

{% include copy-curl.html %}

Example response

...
"aggregations" : {
  "extended_stats_taxful_total_price" : {
    "count" : 4675,
    "min" : 6.98828125,
    "max" : 2250.0,
    "avg" : 75.05542864304813,
    "sum" : 350884.12890625,
    "sum_of_squares" : 3.9367749294174194E7,
    "variance" : 2787.59157113862,
    "variance_population" : 2787.59157113862,
    "variance_sampling" : 2788.187974983536,
    "std_deviation" : 52.79764740155209,
    "std_deviation_population" : 52.79764740155209,
    "std_deviation_sampling" : 52.80329511482722,
    "std_deviation_bounds" : {
      "upper" : 180.6507234461523,
      "lower" : -30.53986616005605,
      "upper_population" : 180.6507234461523,
      "lower_population" : -30.53986616005605,
      "upper_sampling" : 180.66201887270256,
      "lower_sampling" : -30.551161586606312
    }
  }
 }
}

The std_deviation_bounds object provides a visual variance of the data with an interval of plus/minus two standard deviations from the mean. To set the standard deviation to a different value, say 3, set sigma to 3:

GET opensearch_dashboards_sample_data_ecommerce/_search
{
  "size": 0,
  "aggs": {
    "extended_stats_taxful_total_price": {
      "extended_stats": {
        "field": "taxful_total_price",
        "sigma": 3
      }
    }
  }
}