combine.pars {plink} | R Documentation |
This function combines objects of class "irt.pars"
and/or
"sep.pars"
into a single "irt.pars"
object
combine.pars(x, common, grp.names = NULL)
x |
an ordered list containing two or more "irt.pars" objects, two or more
"sep.pars" objects, or a combination of "irt.pars" and "sep.pars"
objects. |
common |
an n x 2 matrix or list of matrices identifying the common items between
adjacent pairs of objects in x . See below for more details. |
grp.names |
character vector of names for all the groups in the returned object |
Although many of the methods in this package allow for lists containing "irt.pars"
and "sep.pars"
objects, it may be helpful to combine the item parameters for multiple
groups into a single object. x
can include a combination of "irt.pars"
and
"sep.pars"
objects. The "irt.pars"
objects can contain information for a
single group or multiple groups. The list elements in x
should be ordered such that
adjacent elements correspond to adjacent groups. If an "irt.pars"
object is included
with multiple groups, the list element following this object should contain information for a
group that is adjacent to the last group in the "irt.pars"
object.
If x
contains only two elements, common
should be a matrix. If x
contains
more than two elements, common
should be a list. In any of the common
matrices
the first column identifies the common items for the first group of two adjacent list elements
in x
. The second column in common
identifies the corresponding set of common
items from the next list element in x
. For example, if x
contains only two list
elements, a single set of common items links them together. If item 4 in group one (row 4 in
slot pars
) is the same as item 6 in group two, the first row of common
would be "4,6"
.
If an "irt.pars"
object is included with multiple groups, common
should correspond
to the set of common items between the last group in the "irt.pars"
object and the
group in the adjacent element in x
.
Returns an object of class irt.pars
Jonathan P. Weeks weeksjp@gmail.com
irt.pars
, as.irt.pars
, sep.pars
,
sep.pars