Author: Zhanshan (Sam) Ma
Title: A Simple Mathematical Model for Estimating the Inflection Points of COVID-19 Outbreaks Document date: 2020_3_27
ID: fttqmts4_29
Snippet: For eqn. (7) indirectly. We used nonlinear optimization method, specifically the R function "nlsLM" from R package "minpack.lm" (https://www.rdocumentation.org/packages/minpack.lm/versions/1.2-1/topics/nlsLM) (Bates & Watts 1988) . Since only T max >0 (negative time is meaningless to count infections) is a necessary condition for the PLEC model to be biometrically sound, we add a constraint d<0 for the non-linear fitting of PLEC model......
Document: For eqn. (7) indirectly. We used nonlinear optimization method, specifically the R function "nlsLM" from R package "minpack.lm" (https://www.rdocumentation.org/packages/minpack.lm/versions/1.2-1/topics/nlsLM) (Bates & Watts 1988) . Since only T max >0 (negative time is meaningless to count infections) is a necessary condition for the PLEC model to be biometrically sound, we add a constraint d<0 for the non-linear fitting of PLEC model.
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