fp_design_matrix {adas.utils} | R Documentation |
Factorial Plan Design Matrix
Description
Builds a design matrix from a one side formula or a number of factors.
Usage
fp_design_matrix(arg, rep = 1, levels = c(-1, 1))
Arguments
arg |
Either a formula or a number of factors. If it is a formula, the
factors are extracted from it. If it is a number, the factors are the first
|
rep |
Number of replications. |
levels |
Levels of the factors. |
Details
Defining relationships are represented as one side formulas, e.g. $I=ABC$
becomes ~A*B*C
.
Value
A design matrix: a subclass of a tibble of class factorial.plan
.
The class has the following attributes:
def.rel
The defining relationship (a formula).
generators
The list of generators (formulas) if the factorial plan is fractional.
fraction
The list of fractions (character vectors) if the factorial plan is fractional.
levels
The levels of the factors (all equal), in coded units.
scales
A list: for each factor, a vector of two values corresponding to the extreme values in coded units.
Examples
fp_design_matrix(3, rep=2, levels=c("-", "+"))