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. 2021 Aug 16;8(11):nwab148. doi: 10.1093/nsr/nwab148

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© The Author(s) 2021. Published by Oxford University Press on behalf of China Science Publishing & Media Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 3. — Overall population movements. (A) Plots of cumulative probability distribution against daily travel distance (log) across all four periods. The subgraph shows the variability of movement within prefecture tiers across all four periods. The cumulative probability distribution of daily travel distances is denoted by p, and the mean distribution over all 60 days is denoted by. For each day k, we calculate the proximity of to to express the variability of movement, and then we arrive at the sum of 60 days’ variation. (B) Plots of the cumulative probability distribution of movements grouped by prefecture tiers against distance (log) for chunyun (10–23 January). Each line represents the probability distribution per day. (C) Plots of travel distance distributions produced by the gravity and radiation models, compared with real data during normal times.

Inline graphic — Overall population movements. (A) Plots of cumulative probability distribution against daily travel distance (log) across all four periods. The subgraph shows the variability of movement within prefecture tiers across all four periods. The cumulative probability distribution of daily travel distances is denoted by p, and the mean distribution over all 60 days is denoted by. For each day k, we calculate the proximity of to to express the variability of movement, and then we arrive at the sum of 60 days’ variation. (B) Plots of the cumulative probability distribution of movements grouped by prefecture tiers against distance (log) for chunyun (10–23 January). Each line represents the probability distribution per day. (C) Plots of travel distance distributions produced by the gravity and radiation models, compared with real data during normal times.