Non-parametric estimation of spatial variation in relative risk.

  title={Non-parametric estimation of spatial variation in relative risk.},
  author={Julia E. Kelsall and Peter J Diggle},
  journal={Statistics in medicine},
  volume={14 21-22},
We consider the problem of estimating the spatial variation in relative risks of two diseases, say, over a geographical region. Using an underlying Poisson point process model, we approach the problem as one of density ratio estimation implemented with a non-parametric kernel smoothing method. In order to assess the significance of any local peaks or troughs in the estimated risk surface, we introduce pointwise tolerance contours which can enhance a greyscale image plot of the estimate. We also… CONTINUE READING