Questionnaire Development Flashcards
What is Cronbach’s alpha and what is it used for?
It’s a test score reliability coefficient indicating the consistency of items within the same test.
What’s the difference between test sensitivity and specificity?
Sensitivity (True Positive Rate) refers to the probability of a positive test, conditioned on truly having the condition
Specificity (True Negative Rate) refers to the probability of a negative test, provided one does not have the condition
Initial item pool should not be too inclusive. Yes/No
NO, it should be overinclusive, to enable the sampling of all potential content
When selecting items to keep, what are some approaches for deciding?
rational theoretical item selection strategy: items appear consistent with construct to researchers/experts
criterion-keyed item selection strategy: item empirically discriminates individuals with/without construct of interest, e.g. healthy vs. clinical groups
internal consistency approach: items represent homogenous factor(s)
What is the goal of factor analysis?
identification of meaningful factors (=subscales) and selection of items with sufficiently high factor loadings