ABSTRACT
The equation https://www.w3.org/1998/Math/MathML"> Z n v = F n f P ′ f v https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780203781098/fb2c8a0a-c93d-4b0b-8b7a-5235753c4848/content/ch5_page73-01_B.tif" xmlns:xlink="https://www.w3.org/1999/xlink"/> has an infinite number of solutions when both F and P are being solved for simultaneously. There is no unique solution unless re-strictions are placed on the solution. Several kinds of restrictions can be made; the type of restriction used is based on the nature of the desired factors. The restrictions can refer to the way in which the set of factors explains the total correlation matrix or can apply to one or only a few of the variables in the total matrix. This chapter contains simple solutions where the factors are defined as a function of only a limited subset of the variables.
