Method Overview

Method Details

summaryStatistics(params){Promise}

Returns an object containing various statistics describing a set of values returned from a field in a FeatureLayer.

Parameters:

params Object See the table below for details of each parameter. Specification: layer FeatureLayer | SceneLayer The layer from which to query attributes for statistics. field String optional The name of the numeric field for which the summary statistics will be generated. normalizationField String optional The field by which to normalize the values returned from the given field. features Graphic[] optional If the FeatureLayer is constructed with client-side graphics or you would like to calculate statistics based on a subset of features, then pass the features in this parameter. minValue Number optional The minimum bounding value for the statistics calculation. Use this in conjunction with maxValue to generate statistics between lower and upper bounds. maxValue Number optional The maximum bounding value for the statistics calculation. Use this in conjunction with minValue to generate statistics between lower and upper bounds.

Returns:

Type	Description
Promise	Returns a promise that resolves to SummaryStatisticsResult.

Type Definitions

SummaryStatisticsResult

The statistics returned from the summaryStatistics() query.

Properties:

avg Number The average of all values returned from the field.

count Number The number of features evaluated.

max Number The maximum of all values returned from the field.

min Number The minimum of all values returned from the field.

stddev Number The standard deviation calculated from values returned from the field.

sum Number The sum of all values returned from the field.

variance Number The calculated variance from all values returned from the field.