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Population values are indicated in thousands.
These data alone are not accurate global representations of all population values through time.
Rather, it highlights the population values of important global cities during important time periods.
Temporally, there are gaps in measured or interpolated population values that are hundreds or thousands of years in duration.
In the ancient time period, Chandler and Modelski's population values sometimes differ for the same city during the same year.
Solutions are ordered into various levels of domination depending on their HP and population values.
Sample page of Chandler's Data Sheets for Ancient Cities section, which is the main section of both city population values and a description of their origin.
As a result, temporal gaps in measured or interpolated population values can be hundreds or thousands of years in duration, especially before AD 1100.
Despite the current spatial and temporal gaps, the dataset does provide a spatially explicit, long historical record of city population values at the global scale.
The regularization has proven useful in obtaining estimates of parameters, which are on average closer to the true population values.
The future estimate population values are extrapolated based on a combination of subnational growth rates from census dates and national growth rates from United Nations statistics.
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