Learn what analysis of variance (ANOVA) is, how it works, and when to use it. See how it helps compare means across multiple data groups in statistics and research.

Pew Research Center’s experts provide analysis of trends shaping the world grounded in the Center’s rigorous empirical research. Because the Center is strictly neutral, its experts do not make policy ...

Meta-analysis is an objective examination of published data from many studies of the same research topic identified through a literature search. Through the use of rigorous statistical methods, it can ...