ConstructContrasts: Construction of contrasts for several factors
Description
Constructs the contrasts for main effects and interaction for a dataframe of factors.
Usage
ConstructContrasts(Factors, MaxOrderIter = 2)
Arguments
Factors
A data frame of factors (For general data frames the functions extracts all the columns that are factors).
MaxOrderIter
Maximum order of the interaction to construct.
Value
Groups
The groups resulting of combining the levels of all the factors.
Contrasts
A matrix of contrasts containing the contrasts that are associated to the main affects and interaction. The rows contain contrasts and the columns the groups to combine.
Effects
A factor describing which contrasts correspond to each effect.
Details
Constructs the contrasts for main effects and interaction for a dataframe of factors. For a general data frame the functions extracts all the factors first. The function constructs the contrasts for all the main effects and the interactions up to order MaxOrderIter.
References
Bapat, R. B. (2012). Linear algebra and linear models. Springer Science & Business Media.