I am quite frustrated with corona graphs in the news, since most reporters seem to have skipped math classes back then. For instance, just plotting the number of confirmed infections at the respective dates does not tell you anything due to the different time point of outbreak. So lets fix that first.
This is still pretty useless as the countries differ in total population and population density, lets turn to something actually comparable.
The values are smoothed using a moving average over four days. This numbers actually allow comparing how well the different countries are doing in their corona countermeasurements, regardless of the population size.
However, this representation is less numerically stable as it diverges to infinity as the infection rate approaches to 1.0.
Actually, it is very similar what we defined as the infection rate above. However, instead of comparing the the absolute number of confirmed from day to day, the change in confirmed over a period of time is used. Therefore, R becomes 0.0 if there are no new infections.
A significant increase of the fatality rate indicates that
However, the mortality rate is a better indicator of the influence of the pandepic on a countries society and economy - especially when the health-system is exhausted.