Can PLACE I, PLACE II, and PLACE III country values be compared directly?

No. PLACE III, PLACE II and PLACE I cannot be directly compared because they use different population inputs (GRUMPv1, GPWv3, and GPWv2, respectively). There are also differences in methodology and spatial precision between the datasets. Each version of PLACE generates a new set of statistics for past decades in order to create a comparable, internally consistent time series. Although the datasets cannot be directly compared, there is still use for the estimates provided in PLACE II and PLACE I, because they each use distinct population estimates as inputs.

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