Many areas of research are looking into questions where the data is nested in layers. In these cases, standard regressions don't do an adequate job finding accurate correlations. Multi-Level Models allow you to use the nested nature of the data to your advantage, and this video gives you a brief introduction to using them.
Your Guide to Multilevel Models Module
Multilevel models allow you to use the nested nature of data to your advantage. This module gives you a brief introduction to using them, including the two main kinds of multilevel models and their pros and cons.