VCA (version 1.3.4)

getSSQqf: ANOVA Sum of Squares via Quadratic Forms

Description

Compute ANOVA Type-1 sum of squares for linear models.

Usage

getSSQqf(Data, tobj, random = NULL)

Arguments

Data

(data.frame) with the data

tobj

(terms) object derived from original formula object

random

(character) vector, optionally containing information about each model term, whether it is random or fixed (only used in mixed models)

Value

(list) representing the with variables:

aov.tab

basic ANOVA-table with degrees of freedom (DF), SS and MS

Lmat

(list) with components 'Z' and 'A'

Details

This function performs estimation of ANOVA Type-1 sum of squares using an approach of expressing them as quadratic forms in y, the column vector of observations. This is an utility function not intended to be called directly. For each term in the formula the design-matrix Z and the corresponding A-matrix Degrees of freedom for each term are determined calling function anovaDF.

Examples

# NOT RUN {
data(dataEP05A2_1)
res <- VCA:::getSSQqf(dataEP05A2_1, terms(y~day/run))
str(res)
# }