1. What is Nested Data Not all data is created to be independent. We often find that the real world data does not meet the strict statistical presumption that each observation should be independent and identically distributed, so-called iid.
By Byoung-gyu Gong
1. What is ILSA and PISA International large-scale assessment (ILSA) is conducted regularly by international organizations to measure and compare many different countries’ educational performance and status.