Menu.pb2levelTab1 {RcmdrPlugin.DoE} | R Documentation |
Basic information for 2-level screening designs
Description
Basic information for 2-level screening design Menu
Brief statistical background
Most of the screening designs are so-called Plackett-Burman designs.
Exceptions occur, where Plackett and Burman did not suggest a design or where
the Plackett-Burman designs coincide with the regular fractional factorial designs
which are not so suitable for screening purposes. For more information, look at
the help file for function pb
from package FrF2.
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
- must be provided and must be a multiple of 4.
- number of factors
- must always be specified. It must be smaller than
the number of runs. The function always creates a design with the number
of factors one less than the number of runs. Those factors not used in the
experiment are named e1, e2 etc. and serve for creating half-normal plots of
the effects.
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 pb
for the function that does the calculations
and Menu.2level
for overall help on the 2-level design menu.
[Package
RcmdrPlugin.DoE version 0.6-10
Index]