What is the length of a sample over the length of the dataset

Question

I need to refer to this quantity in a report, but I do not know what it is called. Basically if a dataset say:

D = {1,2,3,4,5,6,7,8,9,10} has 10 elements in total so |D| = 10 and I take a sample say: S = {1,3,4,10}, the sample has 4 elements so |S| = 4

What is |S|/|D| = 0.4 called. Is this named in a specific way in statistics?

Ted

Answer 1

It is often called the sampling fraction. Another term that is used for the same thing is sampling ratio.