I had worked for some years in ratings (statistics partitioned by commercial purposes).

People used to be interested in graphics that added any sort of 'adjectives' to the facts exposed. Those 'adjectives' mainly consisted in crossreferencing anything.

There is not as much of maths as there is of imagination.

So having all the possible numbers, it could be possible to get the graphs of any crossreference of data.

I imagine having a table where one might choose any row and column of data and even limit more the sort of data to show if required.

Then in some cases, GMT time would be required (4x. rating the average of success of author nodes). And in others, the local time might matter (4x. average of users hours of main participation or hours of participation by country and by month).