Description Usage Arguments Value Author(s) Examples
Function does the 1pl linking according to equating.rasch
from the sirt
package.
Moreover, optional elimination of items with linking DIF is allowed and linking error may be estimated
via the jackknife method if testlets are specified.
1 2 3 4 |
results |
The object returned by |
prmNorm |
Data frame with normed anchor item parameters. Data frame must have at least two columns: items and item difficulties. Use the further arguments 'item', 'domain', 'testlet' and 'value' to define the column in which the corresponding parameter can be found. If 'item', 'domain', 'testlet' and 'value' is NULL, prmNorm must have only two columns: First column items, second column item difficulties. Column names than are arbitrary. |
item |
Optional: Give the number or name of the item identifier column in prmNorm. |
domain |
Optional: Give the number or name of the domain name in prmNorm. Only necessary if item identifiers are not unique in prmNorm (for example, if one item occurs several times, with a global item parameter and a domain-specific item parameter. Domain names in prmNorm must match dimension names in the 'results' object. |
testlet |
Optional: Give the number or name of the testlet name in prmNorm. Only necessary if linking errors should be estimated via the jackknife method. |
value |
Optional: Give the number or name of the parameter column in prmNorm. |
excludeLinkingDif |
Logical. Should items with linking DIF excluded? |
difBound |
Defines the boundary. Items with absolut linking DIF greater than the boundary will be removed from the linking procedure. |
iterativ |
Logical. Should the exclusion of linking DIF items executed in an iterative loop? |
method |
Linking method |
itemF |
Optional: Give the number or name of the item column in results. |
domainF |
Optional: Give the number or name of the domain column in results. |
valueF |
Optional: Give the number or name of the parameter column in results. |
A list with equating information intended for further transformation by the transformToBista
function.
Sebastian Weirich
1 | # see example 5, 6, and 6a in the help file of defineModel()
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