Data Sampling

来源:互联网 发布:python强制类型转换 编辑:程序博客网 时间:2024/06/07 23:20

Simple Random Sampling
--There is an equal probability of selecting any particular item. Sampling without replacement As each item is selected, it is removed from the population.


Sampling with replacement
--Objects are not removed from the population as they are selected for the sample. In sampling with replacement, the same object can be picked up more than once.

 

Stratified sampling

--Split the data into several partitions; then draw random samples from each partition