The data to compile the Official Charts is drawn from a highly complex tracking service representing one of the most sophisticated ongoing market research programmes anywhere in the world.

A tally chart is a simple way of recording and counting frequencies. Each occurrence is shown by a tally mark and every fifth tally is drawn diagonally to make a “gate” of five. The tallies ...

Frequency charts show the tally next to each outcome, along with the frequency of the tally. This is the data gathered from a survey about the colours of cars in a car park. This data can be ...

So in these charts we use a rolling 7-day average of the new infections countries report each day and compare where that average is now to where it was at its peak. The percent of that peak a ...