I have googled a bit to find if there are existing formulas for a computed score, but didn't find anything really profound.

Here is somebody who also proposes using a linear function:
http://stackoverflow.com/questions/2379319/combined-average-for-priority-and-due-date

Request tracker uses a hyperbolic function:
https://www.bestpractical.com/docs/rt/4.2/RT/Action/EscalatePriority.html

Maybe a hyperbolic function would be the best fit. You can put it piecewise together so that it's similar to the -arctan(x) function:

Piecewise[{{1/(x-1)+2, x<0}, {1/(x+1), x>0}}]

You can enter that formula into http://www.wolframalpha.com to see how the function looks like. It would be 1 for tasks due today, going down to zero for tasks due in the future, and going up to 2 for long overdue tasks. Then you could weigh the date contribution with a factor and sum it up with the other contributions for the score.

-- Christoph


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