Answer:
Splitting the data sets into case-specific groupings is known as Stratification.
Explanation:
Stratification is a way of arranging the data or group of the data according to a particular category. It is mainly referred to as the social system or formation of grouping.
Like we group the seeds for planting or the material to build a house, in the same way, we divide the data sets in some case-specific group or group the data in a particular way.