Friday, May 25, 2012

Random facts (statistics)

Differential loss to follow up: Attrition. A type of selection bias found in cohort studies

Reliability: repeatability of a measure

Validity: absence of bias

Bias: systematic error

Selection bias: deferential access to study population (from selection process, respodents no longer available at the end, attrition etc)

Confounding: unfair comparison

Volunteer bias: type of selection bias, the tendency for one's health to influence decision to participate in a study

Information bias: occurs when the means of obtaining information from cases and controls differ

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