Glossary

Privacy floor (n ≥ 5)

The privacy floor is the rule that no figure is reported for a group of fewer than five people. Below five, a "cohort average" is a readout of an identifiable person, so the value is withheld entirely rather than shown with a caveat.

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Also called

n>=5
cohort minimum

How it is measured

Enforced in the database queries that produce every aggregate, not in the interface that displays them. The floor masks rather than annotates: values are nulled and lists emptied, and the size of a withheld group is not disclosed either, because that figure is itself the thing being protected.

What Privacy floor (n ≥ 5) is not

Not a display preference, and not something a sponsor can switch off. Response counts are still shown, because knowing that three of forty people have responded is necessary to chase the other thirty-seven and reveals nothing about anyone’s answers.