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The key difference between Mokken scales and Rasch scales is that the latter assumes that all items have the same item response function. In Mokken scaling the Item Response Functions differ for different items. [5] Mokken scales can come in two forms: first as the Double Monotonicity model, where the items can differ in their difficulty.
The HADS is a 14-item scale, with seven items relating to anxiety and seven relating to depression. [2] Zigmond and Snaith created this outcome measure specifically to avoid reliance on aspects of these conditions that are also common somatic symptoms of illness, for example fatigue and insomnia or hypersomnia .
The name item response theory is due to the focus of the theory on the item, as opposed to the test-level focus of classical test theory. Thus IRT models the response of each examinee of a given ability to each item in the test. The term item is generic, covering all kinds of informative items.
Subscale scores add all scores on the items in the subset and divided by the total number of items in the subset. Subscale score cutoffs for the disorders are as follows: ADHD inattentive type: Teacher score of 2.56, parent score of 1.78. ADHD hyperactive/impulsive type: Teacher score of 1.78, parent score of 1.44.
The Brief Psychiatric Rating Scale (BPRS) is a rating scale which a clinician or researcher may use to measure psychiatric symptoms such as depression, anxiety, hallucinations and unusual behaviour. The scale is one of the oldest, most widely used scales to measure psychotic symptoms and was first published in 1962. [1]
The Wechsler Memory Scale (WMS) is a neuropsychological test designed to measure different memory functions in a person. Anyone ages 16 to 90 is eligible to take this test. The current version is the fourth edition (WMS-IV) which was published in 2009 and which was designed to be used with the WAIS-
The original PSS consists of 14 items that are purported to form a unidimensional scale of global perceived stress. [1] Although scores on the 14-item PSS tend to exhibit good reliability estimates across the literature, four of the items tend to perform poorly when evaluated using exploratory factor analysis. [ 26 ]
It is easier to group the items by targeted scales. The more distinct the other items, the better the chances the items will load better in one's own scale. “Cleanly loaded items” are those items that load at least .40 on one factor and more than .10 greater on that factor than on any others. Identify those in the factor pattern.