Characterization of fixed effects as special case of generalized random effects.
Tõnu Möls, Tatjana Nahtman · Tatra Mountains Mathematical Publications · 2003
The objective of this paper is to emphasize the common nature of fixed and random factors in a mixed linear statistical model. We show that factors can be classified into fixed and random factors by means of covariance matrices of their level effects. In particular, classical reparameterization conditions for fixed factors can be formulated in this way.