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Updated: Jun 17, 2026

Experimental Protocol for Manipulating Plant-induced Soil Heterogeneity
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異質性は必ずしも騒音ではない:改善からの教訓

Frank Davidoff1

  • 1Institute for Healthcare Improvement, Cambridge, Massachusetts, USA. fdavidoff@cox.net

JAMA
|December 17, 2009
PubMed
まとめ

介入効果を見つけるための研究において,参加者の異質性はしばしば抑制される. この研究は,医学が異質性と闘う理由を探究し,研究結果に対するその影響を評価する方法を提案しています.

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Random Error01:04

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Scientists always try their best to record measurements with the utmost accuracy and precision. However, sometimes errors do occur. These errors can be random or systematic. Random errors are observed due to the inconsistency or fluctuation in the measurement process, or variations in the quantity itself that is being measured. Such errors fluctuate from being greater than or less than the true value in repeated measurements. Consider a scientist measuring the length of an earthworm using a...
Random and Systematic Errors01:20

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Scientists always try their best to record measurements with the utmost accuracy and precision. However, sometimes errors do occur. These errors can be random or systematic. Random errors are observed due to the inconsistency or fluctuation in the measurement process, or variations in the quantity itself that is being measured. Such errors fluctuate from being greater than or less than the true value in repeated measurements. Consider a scientist measuring the length of an earthworm using a...
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