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.