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Lecture 5

Lecture 5 – Validity.docx

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Course Code
KIN 330
Peter Hall

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Lecture 5 – Validity What is it? • The extent to which a test measures what it is supposed to measure Relationship between Reliability and Validity • If test is highly valid o Inherently must be reliable • If a test is highly reliable o May or may not be valid because you may be consistently coming up with  the wrong result Systematic Variability • Systematic variability varies in the RIGHT kind or the WRONG kind (BIAS) • Look on slide… Types of Validity: • Face Validity: o Essentially, does it appear to measure what it intends to?  Ie. Measures of ROM o Very LOW criterion o But potentially relevant in human research o Not something that goes very far with research evaluation • Content Validity o Does the measure assess the universe of dimensions relevant to the  phenomenon being measured?  Ie. Pain measurement  Very basic visual analog of pain assessment • Put a line between 0 – 100 representing feeling of pain =  NOT CONTENT SUFFICIENT = NOT CONTENT  VALID • McGill Pain Questionnaire asks for subjective impression,  location, intensity, duration = more CONTENT VALID o Problems:  Assessment is subjective • Who defines the “universe of dimensions”? • Criterion­Related Validity o Concurrent Validity   does the target test correlate with the “gold standard” test? (does it  predict scores on established tests?) • Ex. Assessment of Physical Activity • Gold Standard: Accelerometer vs Self­Reported PA o Accelerometer too expensive to use on large sample  size • Results: poor correlation b/w Accelerometer results and self 
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