What does the primary statistic, elusion rate, indicate?

The elusion rate is a specific metric that measures the effectiveness of the review process in identifying relevant documents that may have been overlooked. Essentially, it indicates how many relevant documents were not coded or misclassified, specifically those that were given a low relevance rank and ultimately left unreviewed.

Choosing the option that describes elusion rate as the count of low-ranked un-coded documents that are relevant reflects an understanding of its role in evaluating the efficiency of document review protocols. This statistic is critical for identifying gaps in the review process where potentially valuable information may have been missed, allowing teams to adjust their approach—such as retargeting their review efforts or refining training for models to better capture relevant documents.

In contrast, the other choices provide alternative metrics or characteristics of the document review process but do not accurately capture the essence of elusion rate. These metrics focus on overall quantities or performance rather than the specific measure of relevant documents that were not coded correctly. Understanding this distinction is key to evaluating the performance of document review and active learning strategies effectively.