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首页> 外文期刊>BMJ: British medical journal >Random measurement error and regression dilution bias
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Random measurement error and regression dilution bias

机译：随机测量误差和回归稀释偏见

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摘要

Random measurement error is a pervasive problem in medical research and clinical practice.1 It occurs when measurements fluctuate unpredictably around their true values and is caused by imprecise measurement tools or true biological variability, or both. For instance, when blood pressure is assessed with a sphygmomanometer, random error may arise from imprecise measurement due to rounding error or from true diurnal or day to day variation in pressure. Hence, a blood pressure reading obtained at a single occasion may differ by an unpredictable (random) amount from an individual's usual blood pressure.Random measurement error differs from systematic measurement error.'' Systematic error occurs when the measurement error, after multiple measurements, does not average out to zero. The measurements are consistently wrong in a particular direction-for example, they tend to be higher than the true values. In the case of blood pressure measurement, systematic error may be due to improper calibration of the sphygmomanometer or improper arm cuff size, and averaging multiple blood pressure measurements will not help estimate true blood pressure.
机译：随机测量误差是一个普遍的问题医学研究和临床实践当测量波动不可预知的他们真正的价值,是由左右不精确的测量工具或真正的生物可变性,或两者兼而有之。压力是评估一个血压计,随机误差可能来自不精确的测量由于舍入误差或从真正的日或一天压力的变化。压力阅读获得在一个场合可能不同的不可预知的(随机)数量从一个人的血压。测量误差与系统不同测量误差。测量误差,经过多次测量,不平均为零。测量一直是错误的特定方向的例子中,他们往往是高于真实值。可能是由于压力测量,系统的错误不当的血压计校准或不当的手臂袖口大小和平均多血压测量不会帮助估计真正的血压。

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