In Legal Search Exact Recall Can Never Be Known – Part One

e-Discovery Team ®

Voltaire “Uncertainty is an uncomfortable position. But certainty is an absurd one.” VOLTAIRE

In legal search you can never know exactly what recall level you have attained. You can only know a probable range of recall. For instance, you can never know that you have attained 80% recall, but you can know that you have attained between 70% and 90% recall. Even the range is a probable range, not certain. Exact knowledge of recall is impossible because there are too many documents in legal search to ever know for certain how many of them are relevant, and how many are irrelevant. I will explain all of these things in this two-part blog, plus show you two ways to calculate probable recall range.

Difficulty of Recall in Legal Search 

60% Red Fish Recall 60% Red Fish Recall

In legal search recall is the percentage of target documents found, typically relevant documents. Thus, for instance, if you know that…

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