15nov2011 - CR Long C502: Biostatistical Thinking 15 Nov...

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CR Long C502: Biostatistical Thinking 15 Nov 2011 Learning Objectives 1. Recognize sources of error 2. Recognize methods of minimizing error Terminology Accuracy Indicates the amount of systematic error present in measurement data. An accurate measurement is free of systematic error. The measurement truthfully reflects the value it is suppose to represent. Precision Indicates the amount of random error present in measurement data. A perfectly precise measurement is free of random error. Sources of random error: study unit to study unit differences (study unit variability) measurement error (observer, study unit and instrument variability) sampling variability other Sources of systematic error: measurement error (observer, study unit and instrument variability) treatment group allocation methods sampling variability other
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CR Long C502: Biostatistical Thinking 15 Nov 2011 Why do we study samples instead of populations? Study of an entire population is usually impossible, and even if it is, samples can be
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This note was uploaded on 01/03/2012 for the course CLIN 51502 taught by Professor Long during the Fall '11 term at Palmer Chiropractic.

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15nov2011 - CR Long C502: Biostatistical Thinking 15 Nov...

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