A comment about estimable functions in linear
models with non estimable constraints
Fabio Humberto Nieto
In the (Searle 1987) book, Linear Models for Unbalanced Data, a characterization
of the estimable functions in linear models with non estimable
constraints is presented. In this informal paper, I indicate another characterization
of these functions which was developed by Magnus and (Magnus
& Neudecker 1988). The aim of the article is to provide a caution signal to
users of linear models theory.
Palabras clave: Estimable functions, Linear models, Non estimable constraints.