Only a few details of the mathematical machinery involved in the mixed models analysis will be
covered here. A more detailed description of mixed model theory will be covered in later
sections of the book. For readers interested in a more formal treatment of the argument details,
they can be found in Sorensen and Gianola (2007). Details of ANOVA for balanced and
unbalanced data can be found in Rawlings et al. (2001) and Milliken and Johnson (2004).