The CES-D scale is a short self-report scale designed to measure depressive
symptomatology in the general population. The items of the scale are symptoms
associated with depression which have been used in previously validated longer
scales. The new scale was tested in household interview surveys and in
psychiatric settings. It was found to have very high internal consistency and
adequate test- ret... hiện toàn bộ
A structural equation model is described that permits estimation of the
reliability index and coefficient of a composite test for congeneric measures.
The method is also helpful in exploring the factorial structure of an item set,
and its use in scale reliability estimation and development is illustrated. The
modeling. estimator of composite reliability it yields does not possess the
general under... hiện toàn bộ
This paper describes an attempt to construct a measuring instrument for
loneliness that meets the cri teria of a Rasch scale. Rasch (1960, 1966)
proposed a latent trait model for the unidimensional scaling of di chotomous
items that does not suffer from the inade quacies of classical approaches. The
resulting Rasch scale of this study, which is based on data from 1,201 employed,
disabled, and jobl... hiện toàn bộ
Unidimensional item response theory (IRT) has be come widely used in the
analysis and equating of edu cational achievement tests. If an IRT model is
true, item responses must be locally independent when the trait is held
constant. This paper presents several mea sures of local dependence that are
used in conjunction with the three-parameter logistic model in the analysis of
unidimensional and two-... hiện toàn bộ
New goodness-of-fit indices are introduced for dichotomous item response theory
(IRT) models. These indices are based on the likelihoods of number-correct
scores derived from the IRT model, and they provide a direct comparison of the
modeled and observed frequencies for correct and incorrect responses for each
number-correct score. The behavior of Pearson’s X2 ( S- X2) and the likelihood
ratio G2 ... hiện toàn bộ
A model is proposed that combines the theoret ical strength of the Rasch model
with the heuristic power of latent class analysis. It assumes that the Rasch
model holds for all persons within a latent class, but it allows for different
sets of item parameters between the latent classes. An estima tion algorithm is
outlined that gives conditional maximum likelihood estimates of item parameters
for e... hiện toàn bộ
Karl Bang Christensen, Guido Makransky, Mike Horton
The assumption of local independence is central to all item response theory
(IRT) models. Violations can lead to inflated estimates of reliability and
problems with construct validity. For the most widely used fit statistic Q3,
there are currently no well-documented suggestions of the critical values which
should be used to indicate local dependence (LD), and for this reason, a variety
of arbitrar... hiện toàn bộ
Michael K. Lindell, Christina J. Brandt, David J. Whitney
The commonly used form of r wg. (J) can display irregular behavior, so four
variants of this index were examined. An alternative index, r* wg. J, is
recommended. This index is an inverse linear function of the ratio of the
average obtained variance to the variance of uniformly distributed random error.
r* wg.Jis superficially similar to Cronbach’s α, but careful examination
confirms that r* wg.Jis... hiện toàn bộ