δ-presence metric, used to estimate how likely it is for an attacker
to figure out that one given individual appears in a de-identified
dataset. Similarly to the k-map metric, we cannot compute δ-presence
exactly without knowing the attack dataset, so we use a statistical
model instead.
.. attribute:: quasi_ids
Required. Fields considered to be quasi-identifiers. No two
fields can have the same tag.
Several auxiliary tables can be used in the analysis. Each
custom_tag used to tag a quasi-identifiers field must appear
in exactly one field of one auxiliary table.
