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We also described the method of item identification in brackets, for example, interviews or focus groups, systematic or unsystematic searches.
CTT has been the standard method of item analysis and has been a valuable tool over many years [ 20].
The latter analysis was not done in our study, because another method of item reduction was used during the development of the LCQ [ 16].
The Mokken scale analysis is a method of item response theory (IRT), which is based on the following assumptions: unidimensionality, local independency and monotonicity.
In summary, the method of item generation for the patient self-report measures was generally comprehensive, with most measures using appropriate methods to generate a pool of items that cover the domain of interest.
We investigated two complementary methods that characterize the occurrence of RS: factor analysis, comprising Principal Component Analysis (PCA) and Multiple Correspondence Analysis (MCA), and a method of Item Response Theory (IRT).
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It presents an overview of the methods of item generation and the research requirements for application.
Sasaki (1991) compared three methods of item differential functioning (DIF) and claimed that DIF could be used to detect placement items that a certain group did not master so that a remediation could be provided.
Methods of item and person parameter estimation which incorporate missing data in the item responses have long been developed and have been proved to be suitable (Lord [1974], [1983]; Mislevy et al. [1992]).
However, this measure was limited by age range and methods of item generation.
Two methods of item analysis were explored, the traditional CTT approach and the more recent IRT method.
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