fp_design_matrix: Factorial Plan Design Matrix

In adas.utils: Design of Experiments and Factorial Plans Utilities

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 n capital letters.
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("-", "+"))

adas.utils documentation built on April 12, 2025, 1:52 a.m.