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Reducing bias in ecological studies: an evaluation of different methodologies

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  • Gillian A. Lancaster
  • Mick Green
  • Steven Lane

Abstract

Summary. Statistical methods of ecological analysis that attempt to reduce ecological bias are empirically evaluated to determine in which circumstances each method might be practicable. The method that is most successful at reducing ecological bias is stratified ecological regression. It allows individual level covariate information to be incorporated into a stratified ecological analysis, as well as the combination of disease and risk factor information from two separate data sources, e.g. outcomes from a cancer registry and risk factor information from the census sample of anonymized records data set. The aggregated individual level model compares favourably with this model but has convergence problems. In addition, it is shown that the large areas that are covered by local authority districts seem to reduce between‐area variability and may therefore not be as informative as conducting a ward level analysis. This has policy implications because access to ward level data is restricted.

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  • Gillian A. Lancaster & Mick Green & Steven Lane, 2006. "Reducing bias in ecological studies: an evaluation of different methodologies," Journal of the Royal Statistical Society Series A, Royal Statistical Society, vol. 169(4), pages 681-700, October.
    • Handle: RePEc:bla:jorssa:v:169:y:2006:i:4:p:681-700
    DOI: 10.1111/j.1467-985X.2006.00418.x
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    References listed on IDEAS

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