na random effects are due to A
nanb random effects due to each nb B levels within A
nanbnw random effects due to each nw levels within B within A:
The Zs are the random effects for each level of the classification. Each Z is assumed to have a mean of zero and to be independent from all other random terms. The variance of the response y is the sum of the variances due to each z component:
Models Supported by the Variability Charts Platform shows the supported models and what the effects in the model would be.

Help created on 9/19/2017