Quantile Classification Method

[Shadim]

Hello,

There are different statistical methods to calculate the quantiles, and I wonder which one is used in ArcGIS Pro. I used the quantile classification method to group my data under different ranks. I need to document which statistical method the software uses to calculate the quantiles. 

Many thanks. 

[DanPatterson]

For categorical data (observations, counts, features etc)

Data classification methods—ArcGIS Pro | Documentation

For interval/ratio data, the frequency distribution would be used to determine the 5 20% bounds