Description Objects from the Class Slots Methods Warning Author(s) References See Also Examples
A design object contains definition and descriptives of a data structure ("design").
Objects can be created by calls of the form new("design")
.
definition
:Object of class "data.frame"
contains the definition of the design
elements
:Object of class "character"
contains the names of the elements of the design (these are simply the column names of definition
units
:Object of class "list"
contains the unique units of elements
nunits
:Object of class "integer"
contains the number of units
structure
:Object of class "data.frame"
contains information on the relation between elements
, the relation between two elements can be "equivalent", "unconnected", "nested", "nestor" (this is the grouping variable of "nested" units), "crossedpartially" or "crossedcompletely"
structureList
:Object of class "list"
contains units of one element in relation to one unit of another element
descriptives
:Object of class "data.frame"
contains information on the number of units of one element with reference to another element
linkList
:Object of class "list"
contains a graph of class "igraph" for each pair of elements
adjacency
:Object of class "list"
contains "adjacency" matrices, see get.adjacency
link
:Object of class "data.frame"
contains link descriptives:
average path length, see average.path.length
relative frequency of realized (unique) pairwise links in reference to all possible pairwise links
relative frequency of realized pairwise links in reference to all theoretically possible pairwise links if elements were completely crossed
mean degree of units, see degree
standard deviation of degree of units, see degree
varCovMatrix
:Object of class "matrix"
, contains the Variance-Covariance Matrix of the design, see Frey (2009) for details
designDescriptives
:Object of class "list"
, contains the D-optimality index that is computed from varCovMatrix
signature(object = "design")
: displays an object of class "design"
signature(e1 = "design", e2 = "design")
: add one design to another ("merge" two designs)
signature(e1 = "design", e2 = "design")
: distract one design from another, this is functional only for designs that contain the same elements
This version is beta. Use with care.
Martin Hecht
Frey, A., Hartig, J., & Rupp, A. A. (2009). An NCME Instructional Module on Booklet Designs in Large-Scale Assessments of Student Achievement: Theory and Practice. Educational Measurement: Issues and Practice, 28(3), 39-53.
1 | showClass("design")
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