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for the 2-level bar chart in update 1, using a legend for the bar colors for True and False would allow you to use the age group labels along the horizontal axis. Here is a simple hack of your BarChart that accomplishes this: BarChart[First /@...

To be fair, one should look at as many of the reporting regions as possible. I've heard some people say they are suspicious of reports from other countries than China, so I would like to see if their hunches hold up. I also wouldn't be surprised...

Outstanding post, Christopher! It's intriguing that the shape of the infected curve in the Simple Example section is fairly symmetrical and does not have the long exponential tail. Generating the phase plane analysis from the simulations is...

"Getting the data into a model" is essentially the process of fitting the adjustable parameters of a model so that the model predicts the data as closely as possible. One needs to fit the data for each country separately. For the influenza models I...

Your points about the susceptible population size are well taken. Unlike modeling chemical reactions in a beaker (the math is the same), one cannot assume instantaneous and uniform mixing in epidemiological models. The population size does have an...