Precision, Reliability, Accuracy and Validity
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Precision, Reliability, Accuracy and Validity
Charles Sturt University
Measurement Error
•All measures within health, sport and physical assessment consists of the actual measurement plus an error.
•When comparing between groups, trials or over time in order to classify and quantify the ‘true’ measure need to minimise or maintain error of measurement
•This is important for accurate data and for research and experimental enquiry.
Charles Sturt University
•Precision-variability in repeated measures on same subject
•Reliability-variability across subjects or measurements
•Accuracy-how close it is to ‘true’ measurement value
•Validity-measures what is intended to be measured
Validity –“am I measuring what I think I’m measuring?”.
Eg.How does a skinfold prediction of % body fat compare with a DEXA result?
-Assessed by ICC (intraclass correlation co-efficient).
Measuring various com
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