You really cannot and should not compare confirmed cases / tests vs deaths when the calculation of confirmed cases or tests varies from place to place. For exa

You really cannot and should not compare confirmed cases / tests vs deaths when the calculation of confirmed cases or tests varies from place to place. For example, South Korea where anyone can get a test, versus the UK where only ill people in hospital will get a test. So what can you do? Possibly compare the number of sick people who have been tested in hospital? Possibly you need to control for demographics, and certainly per population. Possibly compare to official estimates of total population infected (e.g. UK could be around 50K now) Then you can start to look at the differences, but the error rates are going to be large.