COMM 1 Lecture Notes - Lecture 6: Face Validity, Content Validity, Operational Definition
19 Oct 2020
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For measures using questionnaire items: inter-item reliability the reliability is between different items - different scales that you"re comparing. E. g. , test-retest, split-half look at internal consistency of similar items in a scale/index. Undimensional credibility : add scores on all items into one total. Prob: likely to get low cronbach"s alpha (poor reliability) Multidimensional credibility : likely higher reliability because computed separately for each subscale. E. g. , know + exp + comp = expertise dimension. E. g. , trust + honest + unbiased = trustworthiness dimension. For measures using coders (e. g. , behavioral observations): inter-coder reliability. You want a good fit between your conceptual and operational definition. Face validity the measure looks/sounds good on the face of it . Content validity the measure captures the full range of meanings/dimensions of the concept. Criterion - related validation (aka - predictive validity) the measure is shown to predict scores on an appropriate criterion measure. E. g. , sat scores (your potential to achieve)
