Figure 5From: Method for mapping population-based case-control studies: an application using generalized additive modelsThe GAM model properly adjusts for a covariate. The crude map ofthe synthetic data is elevated in the northeast quadrant due to spatial confounding, i.e., spatial clustering of the risk factor age. Adjustment for age produced a quite flat map, an expected result since we constructed the data assuming uniform disease odds within each stratum.Back to article page