Menu.facTab1 {RcmdrPlugin.DoE}R Documentation

Basic information for full factorial designs

Description

This help file describes usage of the basic information tab of the full factorial design menu

Brief statistical background

Full factorial designs consist of all possible combinations of factor levels, i.e. the number of runs is the product of all numbers of factor levels, for example 24 for an experiment with two 2-level factors and one 6-level factor. Of course, their size grows fast with the number of factors. If a full factorial design is not feasible, orthogonal main effects designs or (manually-generated) combinations of smaller designs may be a reasonable option.

Inputs on Tab Base Settings

name of design
must be a valid name. The design itself is created under this name in the R workspace.
number of runs
is a consequence of the specifications on the Factor Details tab. It is displayed for information purposes only; its value is only valid if the Factor Details tab contains entries for all factors.
number of factors
must always be specified. The number of factors must match the number of entries on the Factor Details tab.
replications
is the number of times each experimental run is conducted. If larger than 1, each run is conducted several times. If the checkbox next to the number of replications is checked, it is assumed that the experiment involves repeated measurements for one setup of the experimental run; if it is not checked, the experimental run itself is replicated with everything relevant newly set up (much more valuable than repeated measurements, unless the key driver of variability is in the measuring step). If the check box is not checked, the experiment will be randomized separately for each round of replications (first all first runs, then all second runs etc.).
randomization settings
should normally not be changed; you can provide a seed if you want to exactly reproduce a randomized design created in the past. Unchecking the randomization box will produce a non-randomized experiment. This is usually NOT recommended.

Author(s)

Ulrike Groemping

References

~put references to the literature/web site here ~

See Also

See Also fac.design for the function that does the calculations and Menu.General for overall help on the general factorial design menu.


[Package RcmdrPlugin.DoE version 0.6-10 Index]