Linking item parameters onto a common scale
1986
Loading...
View/Download File
Persistent link to this item
Statistics
View StatisticsJournal Title
Journal ISSN
Volume Title
Title
Linking item parameters onto a common scale
Authors
Published Date
1986
Publisher
Type
Article
Abstract
An item bank typically contains items from several
tests that have been calibrated by administering them
to different groups of examinees. The parameters of
the items must be linked onto a common scale. A
linking technique consists of an anchoring design and
a transformation method. Four basic anchoring designs
are the unanchored, anchor-items, anchor-group, and
double-anchor designs. The transformation design consists
of the system of equations that is used to translate
the anchor information and put the item parameters
on a common scale. Several transformation
methods are discussed briefly. A simulation study is
presented that compared the equivalent-groups method
with the anchor-items method, using varying numbers
of common items, applied both to the situation in
which the groups were equivalent and one in which
they were not. The results confirm previous findings
that the equivalent-groups method is adequate when
the groups are in fact equivalent. When the groups are
not equivalent, accurate linking can be obtained with
as few as two common items. Linking using a more
efficient interlaced anchor-items design can provide
accurate linking without the expense of including explicit
common items in each of the tests.
Keywords
Description
Related to
Replaces
License
Series/Report Number
Funding information
Isbn identifier
Doi identifier
Previously Published Citation
Vale, C. David. (1986). Linking item parameters onto a common scale. Applied Psychological Measurement, 10, 333-344. doi:10.1177/014662168601000402
Suggested citation
Vale, C. David. (1986). Linking item parameters onto a common scale. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/102828.
Content distributed via the University Digital Conservancy may be subject to additional license and use restrictions applied by the depositor. By using these files, users agree to the Terms of Use. Materials in the UDC may contain content that is disturbing and/or harmful. For more information, please see our statement on harmful content in digital repositories.