One grain-scale weighbridge reads 8 percent heavy, and one botanist…

Question

One grain-scale weighbridge reads 8 percent heavy, and one botanist tags damage much more strictly than peers. Which bias is that, and what is it not?

Accepted Answer

Measurement bias from an instrument or labeler, distinct from selection bias and from class-imbalance counts. — Think of one weighbridge that reads 8 percent heavy, and one botanist who tags much stricter than peers. That is measurement bias from an instrument or labeler. It is not a collection-gap story and not a class-count story.

Answer

Selection bias only, because a heavy scale is a weekday-morning collection gap.

Answer

Class imbalance only, because a strict labeler is a 2 percent defect rate.

Answer

Amazon Athena, because a query engine is a measurement instrument.

One grain-scale weighbridge reads 8 percent heavy, and one botanist tags damage much more strictly than peers. Which bias is that, and what is it not?

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