Available with Image Analyst license.
Available with Spatial Analyst license.
Overview
Calculates statistics on values of a raster within the zones of another dataset.
A zone is defined as all areas in the input that have the same value. These areas do not have to be contiguous. When the zone and value inputs are both rasters of the same resolution, they will be used directly. If the resolutions are different, an internal resampling is applied to make the resolutions match before the zonal operation is performed.
For more information, see the How the zonal statistics tools work topic in the Spatial Analyst tool help.
This is a global raster function.
Notes
The Zone Raster must be an integer raster input. If you have feature zones, you must convert the feature into a raster before it can be used in this function. While performing the conversion, use the cell size and snap raster environment of the Value Raster.
When specifying the input zone data, the default Zone Field will be the first available integer or text field.
The Value Raster can be either integer or floating point. However, when it is floatingpoint type, the zonal calculations for Majority, Minority, and Variety will not be computed.
The data type of the output is dependent on the zonal calculation being performed and the input Value Raster type. See How Zonal Statistics works for more information.
For Majority and Minority calculations, when there is a tie, the output for the zone is based on the lowest of the tied values.
Parameters
Parameter name  Description 

Zone Raster (Required)  Dataset that defines the zones. The zones can be defined by an integer raster. 
Zone Field (Required)  Field that holds the values that define each zone. It can be an integer or a string field of the zone raster. 
Value Raster (Required)  Raster that contains the values on which to calculate a statistic. 
Statistics Type  Statistic type to be calculated.

Ignore NoData in calculations  Denotes whether NoData values in the Value Raster will influence the results of the zone that they fall within.

Process as multidimensional  Determines how the input multidimensional value raster is processed.

Percentile Value  The percentile to calculate. The default is 90, for the 90th percentile. The values can range from 0 through 100. The 0th percentile is essentially equivalent to the Minimum statistic, and the 100th percentile is equivalent to Maximum. A value of 50 will produce essentially the same result as the Median statistic. 
Percentile interpolation type  Determines the method of percentile interpolation to be used when the number of values from the input raster to be calculated are even.

Environment settings
Geoprocessing environment settings for global functions are controlled at the application level. Setting processing environments in ArcGIS Pro can be done by clicking the Environments button on the Analysis tab. See Analysis environments and Spatial Analyst for additional details on environment settings.
The following environments are supported by this global function: