It's almost time to fill in your census form - but what's the point in it? Joining us this week is senior statistician with the CSO Cormac Halpin to examine how the questions are set, what changes you might spot on this year's edition, and what exactly the data is used for once collected.The Explainer is brought to you by The Journal. Providing open access to valuable journalism in Ireland has been the aim of The Journal for a decade. You can contribute to ensure we can keep questioning, investigating, debunking, explaining and informing at www.thejournal.ie/contribute/

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