Available with Image Analyst license.
Available with Spatial Analyst license.
Overview
This function calculates statistics from multiple rasters, on a pixelbypixel basis. The available statistics are majority, maximum, mean, median, minimum, minority, range, standard deviation, sum, and variety.
Notes
The order of the input rasters is irrelevant for this raster function.
If a single raster is used as the input for maximum, minimum, mean, median, majority, minority, or sum, the output pixel values will be the same as the input pixel values. If a single raster is used for range or standard deviation, the output cell values will all be 0. If a single raster is used for variety, the output pixel values will all be 1.
For each Operation, you can also choose to calculate the statistics by excluding all the NoData pixels.
Parameters
Parameter name  Description 

Rasters (Required)  The list of rasters from which to calculate statistics, on a pixelbypixel basis. 
Operation  The type of statistical calculation that you want to perform. The available statistics are Majority, Maximum, Mean, Median, Minimum, Minority, Range, Standard Deviation, Sum, and Variety. The default is Majority 
Cellsize Type  Choose which cell size to use in the output raster. If all the input cell sizes are the same, all the options will yield the same results.

Extent Type  Choose which extent should be used in the output raster:

Learn more about the operations
Here is a list of all of the operations and a description for each of them. For more information about each of the operations, see How Cell Statistics works.
Parameter name  Description 

Majority  Determines the value that occurs most often on a pixelbypixel basis. 
Maximum  Determines the largest value on a pixelbypixel basis. 
Mean  Calculates the average on a pixelbypixel basis. 
Median  Calculates the middle value of the pixels on a pixelbypixel basis. 
Minimum  Determines the smallest value on a pixelbypixel basis. 
Minority  Determines the value that occurs least often on a pixelbypixel basis. 
Range  Calculates the difference between the largest and the smallest value on a pixelbypixel basis. 
Standard Deviation  Calculates the standard deviation of the pixels on a pixelbypixel basis. 
Sum  Calculates the total value on a pixelbypixel basis. 
Variety  Calculates the number of unique values on a pixelbypixel basis. 
Majority (Ignore NoData)  Determines the value that occurs most often on a pixelbypixel basis. Only cells that have data values will be used in determining the statistic value. If a NoData value exists at a certain location, the NoData value will be ignored. 
Maximum (Ignore NoData)  Determines the largest value on a pixelbypixel basis. Only cells that have data values will be used in determining the statistic value. If a NoData value exists at a certain location, the NoData value will be ignored. 
Mean (Ignore NoData)  Calculates the average on a pixelbypixel basis. Only cells that have data values will be used in determining the statistic value. If a NoData value exists at a certain location, the NoData value will be ignored. 
Median (Ignore NoData)  Calculates the middle value of the pixels on a pixelbypixel basis. Only cells that have data values will be used in determining the statistic value. If a NoData value exists at a certain location, the NoData value will be ignored. 
Minimum (Ignore NoData)  Determines the smallest value on a pixelbypixel basis. Only cells that have data values will be used in determining the statistic value. If a NoData value exists at a certain location, the NoData value will be ignored. 
Minority (Ignore NoData)  Determines the value that occurs least often on a pixelbypixel basis. Only cells that have data values will be used in determining the statistic value. If a NoData value exists at a certain location, the NoData value will be ignored. 
Range (Ignore NoData)  Calculates the difference between the largest and the smallest value on a pixelbypixel basis. Only cells that have data values will be used in determining the statistic value. If a NoData value exists at a certain location, the NoData value will be ignored. 
Standard Deviation (Ignore NoData)  Calculates the standard deviation of the pixels on a pixelbypixel basis. Only cells that have data values will be used in determining the statistic value. If a NoData value exists at a certain location, the NoData value will be ignored. 
Sum (Ignore NoData)  Calculates the total value on a pixelbypixel basis. Only cells that have data values will be used in determining the statistic value. If a NoData value exists at a certain location, the NoData value will be ignored. 
Variety (Ignore NoData)  Calculates the number of unique values on a pixelbypixel basis. Only cells that have data values will be used in determining the statistic value. If a NoData value exists at a certain location, the NoData value will be ignored. 