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There exists a great variety of matrix operations and functions with
much broader scope than the limited selection given in this chapter.
For example, there are two other forms of matrix multiplication in
common use, direct or kronecker products, and dot products. Similar
extensions to addition and subtraction exist, and numerous matrix
functions beyond determinant and trace can be defined. One place to
study further operations is Searle (1982); applications and some
definitions can be found in Neale (1997). We
hope that the outline provided here will make understanding structural
equation modeling of twin data much easier, and provide a starting
point for those who wish to study the subject in more detail.