strength {dae}

Generate paper strength values

Description

Generates paper strength values for an experiment with different temperatures.

Usage

strength(nodays, noruns, temperature, ident)

Arguments

nodays

The number of days over which the experiment is to be run.

noruns

The number of runs to be performed on each day of the experiment.

temperature

A factor that encapsulates the layout by giving the temperature to be investigated for each run on each day. These must be ordered so that the temperatures for the first day are given in the order in which they are to be investigated on that day. These must be followed by the noruns temperatures for the second day and so on. Consequently, the factor temperature will have nodays*noruns values.

ident

The digits of your student identity number. That is, leave out any letters.

Value

A data.frame object containing the factors day, run and temperature and a vector of the generated strengths.

Author(s)

Chris Brien

Examples

## Here temperature is a factor with 4*3 = 12 values whose
## first 3 values specify the temperatures to be applied in
## the 3 runs on the first day, values 4 to 6 specify the
## temperatures for the 3 runs on day 2, and so on.
temperature <- factor(rep(c(80,85,90), 4))
exp.strength <- strength(nodays = 4, noruns = 3,
                         temperature = temperature, ident = 0123456)

## In this second example, a completely randomized design is generated 
## for the same 3 temperatures replicated 4 times. The layout is stored 
## in the data.frame called Design.
Design <- designRandomize(allocated = temperature, 
                          recipient = list(runs = 12), 
                          seed = 5847123)
## eradicate the unrandomized version of temperature
remove("temperature")

## The 12 temperatures in Design are to be regarded as being assigned to 
## days and runs in the same manner as for the first example.
exp.strength <- strength(nodays = 4, noruns = 3,
                         temperature = Design$temperature, ident = 0123456)