Questionnaire Development Flashcards

1
Q

What is Cronbach’s alpha and what is it used for?

A

It’s a test score reliability coefficient indicating the consistency of items within the same test.

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2
Q

What’s the difference between test sensitivity and specificity?

A

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

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3
Q

Initial item pool should not be too inclusive. Yes/No

A

NO, it should be overinclusive, to enable the sampling of all potential content

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4
Q

When selecting items to keep, what are some approaches for deciding?

A

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)

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5
Q

What is the goal of factor analysis?

A

identification of meaningful factors (=subscales) and selection of items with sufficiently high factor loadings

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