Bias in the Northern Ireland Omnibus June 2012 sort card module?

David Gordon, Shailen Nandy and Demi Patsios

The statistical briefing examines the implications of a programming error that resulted in higher than expected amounts of missing data in the ‘sort card’ sample of the June 2012 Northern Ireland Omnibus Necessities Module. It concludes that the missing data can be considered to be MAR (Missing At Random) and they are ignorable for analyses of the proportion of respondents considering an item or activity to be a necessity as long as both the missing data and the don’t knows are excluded from the numerator and denominator i.e. if the don’t knows are set to ‘missing’.

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