How standard deviation is calculated for number of rasters in the Cell statistic tool?
The output is a raster where each pixel represent the STD. I want to understand the equation behind it.
You must have missed the reference
How Cell Statistics works—ArcGIS Pro | Documentation
The basic STD equation uses the population method and not the sample.
Note that the standard deviation is calculated on the entire population (the N method); it is not estimated based on a sample (the N-1 method).
There's nothing complex going on, its the STD calculated from coincident raster cell values.
Standard Deviation and Variance (mathsisfun.com)
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