Using census data: religion as a key variable in studies of Northern Ireland

"For the first time since a question on religion was first included in the Census of Population (in 1861), the recently published results of the 1991 Census show that less than half of the population of Northern Ireland declared themselves as belonging to a Protestant Christian denomination. Discussions surrounding the future political and constitutional arrangements for Northern Ireland frequently include evidence adduced about the relative size of the two 'tribes' widely identified by the labels 'Protestant' and 'Catholic'. The major source of that evidence comes from the question on religion contained in the Northern Ireland Census, and this paper is concerned with the nature and use of that data. The legitimacy of certain uses of the data is questioned; the reliability of the data is considered; and certain tentative findings are presented based on the data published in the (hard copy) reports."