R: Generate mixture

gen.mixture {AlgDesign} | R Documentation

## Generate mixture

### Description

Creates a candidate list of mixture variables.

### Usage

    gen.mixture(levels,vars)

### Arguments

`levels` | An integer greater than 1. The number of levels of the mixture variables.
`vars` | Either the number of variables, or a character vector of variable names.

### Details

Similar in function to gen.factorial(), but for mixture variables such that the rows sum to unity. For `levels=2`, the identity matrix is produced, so that each variable is either 0 or 1. For `levels=3`, rows are added to the identity containing two variables at 1/2 and the others at 0. etc.

In general, a mixture model of degree d will have the same number of terms as the candidate list generated by `gen.mixture` for `levels=d+1`, and this will be optimal.

### Author(s)

Bob Wheeler bwheelerg@gmail.com

Please cite this program as follows:

Wheeler, R.E. (2004). gen.mixture. AlgDesign. The R project for statistical computing http://www.r-project.org/

[Package AlgDesign version 1.1-7.3 Index]