Geographic Validation.
In geographic validation, the model is validated in a different location that was not used to develop the model. The purpose of geographic validation is to confirm that the model remains accurate when it is tested in data from other locations. Although it may be questioned whether a model developed in another location will work in a new location that is completely different. Geographical validation can be achieved by applying and assessing the performance of a developed model to a different site within the same region or a different cohort from a different region. For example, a model developed in the USA for predicting hypertension can be validated in a similar Canadian cohort.