Intuitively, what it means to derail on a Beeminder goal is that you’re in still in the red when your deadline hits. (In bright-red-staircase world you’d derail at the exact instant you cross the bright red line.) There’s more background on this in a years-old forum thread and I wanted to think through a proposal from @zzq and try putting it in my own words. Status quo: A Beeminder goal is deemed to be derailed if yesterday’s datapoint is in the red. Advantages of that definition: It...
