mc.get.initial.design: mc.get.initial.design

Description

Given a set of cards, determine an initial design including extra cards.

Usage

mc.get.initial.design(full.design, cards = NULL, extra.cards = 3, slack = 1, tol = 0.2, max.trials = 100)

Arguments

full.design

All cards (combinations of levels) that are deemed possible

cards

The number of cards in the base design. If this is null then the minimum possible number of cards + 3 (to allow for model fit issues) is used.

extra.cards

The number of extra cards added to the base design

slack

How much the number of each factor can vary in a "good" design

tol

The largest cross correlation in a "good" design

max.trials

The maximum number of samples of extra.cards cards to look at.

Value

A design with cards + extra.cards rows

Details

This can be slow for big designs (lots of samples, a long time testing each one). You can set max.trials to limit the length of time the function runs. It will use the best sample it has seen.

For finer control call mc.get.one.design and mc.add.to.design separately.

Examples

Run this code

data(hire.candidates)

#default except max.trials=10 for speed

hire.questionaire = mc.get.initial.design(hire.candidates,max.trials=10)

#A base design of 10 cards with 5 extra cards and good cross correlations less than .17
#takes about 10 seconds

#hire.questionaire = mc.get.initial.design(hire.candidates,cards=10,extra.cards=5,tol=.17)