Health Sciences 2801A/B Lecture Notes - Lecture 5: Observational Error, Confidence Interval

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It is called retest, because there is a score that is obtained a retest score which is obtained under a second situation. We should assume that every score is affected by measurement error. Unsystematic error increases or decreases scores by an unpredictable amount (often cancels itself out) Systematic bias changes every score in the same direction by a constant amount (ex. Two times of assessment (initial & follow up) Two forms of assessment (version a & b) Always assume that there is going to be unsystematic error. Due to measurement error, it is unlikely that the same score would be observed if someone is assessed twice (may look the same if rounded, but is different w/ enough decimals) Consistency coefficient indicates the degree to which the two sets of scores differ as a result of unsystematic error. (iccc) Systematic bias does not decrease the consistency coefficient because it is based solely on the amount of unsystematic error.

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