A Formula for Type III Sums of Squares
Methodology
2018-04-03 v1
Abstract
Type III methods were introduced by SAS to address difficulties in dummy-variable models for effects of multiple factors and covariates. They are widely used in practice; they are the default method in several statistical computing packages. Type III sums of squares (SSs) are defined by a set of instructions; an explicit mathematical formulation does not seem to exist. An explicit formulation is derived in this paper. It is used to illustrate Type III SSs and their properties in the two-factor ANOVA model.
Keywords
Cite
@article{arxiv.1804.00545,
title = {A Formula for Type III Sums of Squares},
author = {Lynn Roy LaMotte},
journal= {arXiv preprint arXiv:1804.00545},
year = {2018}
}
Comments
arXiv admin note: text overlap with arXiv:1708.06483