KIN 3982 Lecture Notes - Lecture 10: Criterion Validity, Concurrent Validity, Face Validity

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6 Mar 2019

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Wednesday, March 6, 2019
2:31 PM
Overview of Validity
Instrument: any type of measurement in a study
o Test, questionnaire, interview
Validity: extent to which the instrument accurately measures what it is
supposed to measure
o Matter of degree (no instrument is completely valid)
Why is there no perfectly valid scale?
o Dependent on the sample it is developed with
o Some areas are difficult to measure
Types of Validity
Content validity: researchers makes judgments regarding whether the
instrument contains the correct items
o Broad sample of items
o Important material should be emphasized
Face validity: whether or not the instrument appears to be valid based on an
o Sometimes use low face validity on purpose when trying to disguise
Criterion validity: how well the measure correlates to a criterion
o Predictor validity: does the instrument predict the criterion measure
o Concurrent validity: does the instrument correlate with another
Construct validity: do items adequately measure the theoretical construct
o Can only obtain indirect evidence
o Uses both judgment (examining items) and empirical evidence
(correlating with other measures)
Reliability: yielding consistent results
o Longer tests are often more reliable
o It is possible to have high reliability but low validity
o In order for an instrument to be useful, it should be both moderately
reliable and valid
Types of Reliability
Interobserver reliability: when scores from two observers of a behavior
significantly correlate with one another
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