Journal of Official Statistics, Vol.27, No.2, 2011. pp. 279–299
Effects of Increasing the Incentive Size in a Longitudinal Study
Willard L. Rodgers
Abstract:To assess the possible impacts of increasing the incentive size on response rate and data quality, at one wave of a longitudinal study sample members were randomly assigned to receive one of three incentives: the same $20 incentive per person they had received in previous waves; $30; or $50. Those offered $50 had a higher response rate than those offered $20, and this positive impact persisted for at least the next four waves of biennial data collections. There is some evidence that higher incentives improve data quality as indicated by probabilities of failing to answer questions and of giving responses that would reduce the interview length.
Keywords:Panel attrition, data quality, respondent incentives, nonrandom missing data
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