Discriminant Validity Involves How Much Constructs Discriminate from Each Other

525 Words Feb 18th, 2018 2 Pages
While, convergent validity involves how much corresponce two diagnostic categories. A construct needs to have both of these to have construct validity, which is how valid the inferences from the diagnostic tools are. This essay argues that there have not been improvements in overall construct validity from DSM-IV to DSM-V. However, there have been improvements in discriminant validity in DSM-V compared with DSM-IV.
DSM-IV contains poor discriminant validity, due to the huge symptom overlap from the categorical approach used (Vieta & Phillips, 2007). Regier et al. (2013) stated that the DSM-IV strict categories have not been supported by research. Vieta and Phillips (2007) state that many patients do not fit the categories, most patients do not reach a sufficient severity or duration to qualify for a diagnosis in that category, and lastly a patient may fit a criteria for several conditions because there is so much symptom overlap.
DSM-IV manages the problems by allowing professionals to put patients into broad categories such as the Not Otherwise Specified categories to allow for co-existence of various diagnoses in the same patient (Vieta & Phillips, 2007). However, there is still the problem of comorbidity, where a patient has two disorders (Vieta & Phillips, 2007). In addition, the validity of…
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