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. 2011 Mar 31;6(3):e17823. doi: 10.1371/journal.pone.0017823

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Picoli Junior et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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The model is given by Eq. (3), with and p = 0.85. Initial condition: there are only one country with y(t = 0) = 1. (A) Temporal evolution of the total number of confirmed cases, Y(t), on mono-log scale, for time steps from 1 to 70. The solid line is given by , with λ = 0.05. (B) Temporal evolution of the total number of countries with confirmed cases, W(t), for the same time steps. The solid line is . (C) Cumulative distribution, R(y), for t = 10 steps (squares), t = 30 (up triangles), t = 50 (down triangles) and t = 70 (circles). For comparison, we show a power law given by Eq. (1), for t = 10, and a lognormal curve given by Eq. (2) for t = 10 steps.

Inline graphic — The model is given by Eq. (3), with and p = 0.85. Initial condition: there are only one country with y(t = 0) = 1. (A) Temporal evolution of the total number of confirmed cases, Y(t), on mono-log scale, for time steps from 1 to 70. The solid line is given by , with λ = 0.05. (B) Temporal evolution of the total number of countries with confirmed cases, W(t), for the same time steps. The solid line is . (C) Cumulative distribution, R(y), for t = 10 steps (squares), t = 30 (up triangles), t = 50 (down triangles) and t = 70 (circles). For comparison, we show a power law given by Eq. (1), for t = 10, and a lognormal curve given by Eq. (2) for t = 10 steps.