Find out whether anybody in your data is alone CROWD
Taking the names out does not make a dataset anonymous. A date of birth, a postcode and a sex identify most people on their own, and this works out who that is.
The dataset
The file you are about to publish, or hand over, or attach to an answer. It is read by this tab and goes nowhere, which is the only sensible way to handle a file precisely because you are not yet sure what is in it.
What each column is
This is the step that decides whether the answer means anything. A quasi-identifier is anything somebody could already know or look up about a person: their age, their postcode, their sex, the date they were admitted. The guesses below come from the headings and from how varied each column is; they are guesses.
Is anybody alone
The combinations too few people share
What to do about it
The check, written out
What you marked as what, what came back, and what you were offered. This is the thing to keep on the file: a release nobody can show they checked is indistinguishable from one nobody checked.
How it works
CROWD checks a CSV for re-identification risk using k-anonymity, which finds people who are alone in their group, and l-diversity, which finds groups where everyone shares the same sensitive value. A good score reduces risk but does not prove a release is safe. Your data stays in this tab.
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