Nice use of matplotlib. I'd like to apply this to US states as well.
Although even between states the variation in test rate is so great that it's hard to gather much from it.
I personally use hospitalizations as a more accurate metric of total infections in the US. For example, Washington is being hailed as doing a great job to slow the virus down, but ~80% of the confirmed tests result in hospitalizations, because they still just don't test you otherwise [0]. Compare that with a more realistic hospitalization rate (many states with a lot of cases are around 10% -- who would have guessed it would be Louisiana and Florida doing the broad testing?)
Although even between states the variation in test rate is so great that it's hard to gather much from it.
I personally use hospitalizations as a more accurate metric of total infections in the US. For example, Washington is being hailed as doing a great job to slow the virus down, but ~80% of the confirmed tests result in hospitalizations, because they still just don't test you otherwise [0]. Compare that with a more realistic hospitalization rate (many states with a lot of cases are around 10% -- who would have guessed it would be Louisiana and Florida doing the broad testing?)
[0] https://en.wikipedia.org/wiki/Timeline_of_the_2020_coronavir...