Matrix Notation
Here, we describe how symbols are used on the Stat Trek web
site to represent
vectors,
matrices,
and other matrix algebra entities.
Vectors
Bold-face, lower-case letters refer to vectors;
and italic lower-case letters refer to vector elements. For example,
- ai refers to the ith element in vector a.
General Matrices
Bold-face, capital letters refer to matrices,
italic capital letters refer to matrix elements, and
subscripts reveal matrix
dimension.
For example,
- Aij
refers to an i by j matrix A.
Special Matrices and Matrix Properties
Special matrices are represented by special notation. For example,
- x refers to a matrix of
deviation scores
derived from the raw scores of matrix X.
Note: Like vectors, deviation score matrices are often denoted
by a lower-case, boldface letter, such as x.
This can cause confusion, but usually the meaning is clear from the context.