The default form of regression equation in WOMBAT is chosen to account for rank deficiencies in the fixed effects part of the coefficient matrix in the MME when estimating variance components. If your aim is to obtain `adjustment factors' for other analyses, it is best to fit the appropriate model from the start.
When fitting a complicated fixed effects model, care is needed in the interpretation of results, paying particular attention to the estimability of individual effects!
SumModel.out). You can then calculate your coefficients as: