I've just submitted my continuous professional development records to the professional body I'm a member of. They use a rather clunky data entry web form, and once everything goes through you get some dashboards (of course!). The code behind dashboard generation is quite inflexible, it really couldn't believe I would give it zero for red, blue and green metrics, so it still zooms on them in a second pie chart, where 3 zeroes take a third of the pie each. Is there an official name for this shaded pie-chart? Soup bowl perhaps?
Now going to the bar chart showing all categories with a choice of metric between Mode, Mean and Median. Mode is a really odd choice for what is really a continuous metric, and sure enough, by selecting it I get an error:
The means and the medians are shown belowOne or more CPD Hours sets has no single modal value
The blue is my set. The mean of 107.2 matches the total of the set average pie chart. That is not the case with the median, but of course the sum of medians is not the median of the sums, whereas the sum of averages is the average of the sums. The fact the sum of medians is actually much smaller than the median of sums, shows us that most members of the set don't divide their time equally. There's scope for a whole other post on statistics of statistics here, I'll do that some other time.