Heaping and leaping: survey response behaviour and the dynamics of self-reported consumption expenditure

Stephen Pudney

No 2008-09, ISER Working Paper Series from Institute for Social and Economic Research

Abstract: Survey respondents often use simple strategies to answer retrospective questions about their level of consumption expenditure, resulting in the heaping of data at certain round numbers. In the panel context, wave-to-wave ‘leaping’ from one ‘heap’ to another can distort the sample pattern of consumption movements over time. Using BHPS energy expenditure data, we show that respondents use a variety of different response strategies, often switching between those strategies. We estimate a joint model of the dynamics of consumption and response behaviour and find that neglect of response behaviour can lead to serious biases in empirical studies of consumption dynamics.

Date: 2008-03-10
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