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Reliability & Validity (Reliability (Types (1) Test Retest Reliability…
Reliability & Validity
Reliability
Refers to the consistency or precision in measurements; are measurements repeatable?; Factors that affect it: Day, time, weather
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1) Subject error
2) Subject bias (wingate test bike: the guy who wants to do better)
3) Observer error & Bias (Lucisate? vs water) (Tamiflu try to sell their drugs for billions of pounds, they tried to remove 76% of their fundings for research)
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Validity
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Types
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Logical Validity (face validity) : superficial measure of validity and what the measurement procedure appears to measure.
Criterion Validity (CP) (qualisys system, error of 1 mm) Gold Standard (3D systems) : Established by comparing a new or untested measurement tool against accepted measurement technique. Composed of: Concurrent validity (10): Does the test relate to the gold standard measure? (wingate test individually) Predictive validity (11): Can the result of a test predict the outcome of another test? (Skin fold Caliper)
Construct validity: The degree to which a test measures a hypothetical construct and is usually established by relating the test results to some behaviour. (really confident in my validity, measure it twice) EX: Physiology and Psychology correlates to measure anxiety. Eyes of referee, TV, are they out? frame by frame. EXTRA MEASURE
Ecological validity (real world) Agility for tennis, T test; (slide 15)
Internal validity vs. External validity
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Objectivity
Objectivity, laboratory settings sports science, self portrait
- Philosophical (nature of truth)
- Bias (control) – objectivity to subjectivity
- Can you control all the controllable variables?