A balanced ANOVA is an ANOVA in which the number of replicates (sets of identical observations) is restricted to be the same for each factor level (treatment group).
Balanced ANOVA
See also
ANOVAExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Balanced ANOVA." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/BalancedANOVA.html