Description Usage Arguments Details Value Note Author(s) References See Also Examples
This function allows to inspect the list of available orthogonal arrays, optionally specifying selection criteria
1 2 3 
name 
character string or vector of character strings giving name(s) of (an) orthogonal array(s); results in an error if name does not contain any valid name; warns if name contains any invalid name 
nruns 
the requested number of runs or a 2element vector with a minimum and maximum for the number of runs 
nlevels 
a vector of requested numbers of levels for a set of factors in question,
must contain integers > 1 only; 
factors 
a list with the two elements 
regular 
either unrestricted (the default “all”), a logical which requests
( 
GRgt3 
either unrestricted (the default “all”), or a character string which requests

Rgt3 
logical requesting inclusion of standard resolution 3 arrays as listed in

show 
an integer number specifying how many arrays are to be listed (upper bound),
or the character string 
parents.only 
logical specifying whether to show only parent arrays or child arrays as well;
the default is 
showGRs 
logical specifying whether to show the generalized resolution quality metrics
with the resulting arrays; the default is 
showmetrics 
logical specifying whether to show all array quality metrics with the resulting
arrays; the default is 
digits 
integer number of significant digits to show for GR and A metrics;
irrelevant, if 
The function shows the arrays that are listed in the data frames oacat
or oacat3
.
For child arrays that have to be generated with a lineage rule
(can be automatically done with function oa.design
), the lineage is displayed
together with the array name. The option parent.only = TRUE
suppresses printing and output of child arrays. The structure of the lineage entry
is documented under oacat
.
If display of metrics is requested with showmetrics=TRUE
, the printed output shows the metrics
GR*, GRind*, regular (logical, whether regular or not), SCones* (number of squared canonical correlations that are 1),
and the numbers of words of lengths 3 to 8 (A3 to A8). showGRs=TRUE
requests the metrics marked with asterisks only (without SCones
in case GRgt3="ind"
). More information on
all these metrics can be found here
A data frame with the three columns name
, nruns
and lineage
,
containing the array name, the number of runs and  if applicable  the lineage for generating the array
from other arrays. The lineage entry is empty for parent arrays that are either directly available
in the package and can be accessed by giving their name (e.g. L18.3.6.6.1
) or are full factorials
(e.g. L28.4.1.7.1
). If further information has been requested (e.g. with showmetrics=TRUE
),
the data frame contains additional columns.
If no array has been found, the returned value is NULL
.
Thanks to Peter Theodor Wilrich for proposing such a function.
Ulrike Groemping
Kuhfeld, W. (2009). Orthogonal arrays. Website courtesy of SAS Institute http://support.sas.com/techsup/technote/ts723.html.
Mee, R. (2009). A Comprehensive Guide to Factorial TwoLevel Experimentation. New York: Springer.
oa.design
for using the arrays from oacat
in design creation
oacat
for the data frames underlying the function
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18  ## the first 10 orthogonal arrays with 24 to 28 runs
show.oas(nruns = c(24,28))
## the first 10 orthogonal arrays with 24 to 28 runs
## excluding child arrays
show.oas(nruns = c(24,28), parents.only=TRUE)
## the orthogonal arrays with 4 2level factors, one 4level factor and one 5level factor
show.oas(factors = list(nlevels=c(2,4,5),number=c(4,1,1)))
## show them all with quality metrics
show.oas(factors = list(nlevels=c(2,4,5),number=c(4,1,1)), show=Inf, showmetrics=TRUE)
## pick only those with no complete confounding of any degrees of freedom
show.oas(factors = list(nlevels=c(2,4,5),number=c(4,1,1)), GRgt3="ind", showmetrics=TRUE)
## the orthogonal arrays with 4 2level factors, one 7level factor and one 5level factor
show.oas(factors = list(nlevels=c(2,7,5),number=c(4,1,1)))
## the latter orthogonal arrays with the nlevels notation
## (that can also be used in a call to oa.design subsequently)
show.oas(nlevels = c(2,7,2,2,5,2))
## calling arrays by name
show.oas(name=c("L12.2.11", "L18.2.1.3.7"))

Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.