If it’s a computed trend-line rather than something someone eyeballed then in my book that is a fitted curve. Anyway, that makes sense; presumably it goes below zero somewhere a little to the left of where it stops. Given the obvious discontinuity, it might have made more sense to plot separate lines for before and after...
It’s computed, yes. And I defer to your grasp of the terminology!
And yes, separate trend-lines for before and after the red vertical line might have been good; if the graph’s creator makes such a version, I will post it.
That fitted curve looks pretty dubious in its earlier parts. (Maybe I’m misunderstanding and it isn’t a fitted curve at all?)
It isn’t a fitted curve, no. It’s just a trend-line, which looks curved due to the log y-axis.
If it’s a computed trend-line rather than something someone eyeballed then in my book that is a fitted curve. Anyway, that makes sense; presumably it goes below zero somewhere a little to the left of where it stops. Given the obvious discontinuity, it might have made more sense to plot separate lines for before and after...
It’s computed, yes. And I defer to your grasp of the terminology!
And yes, separate trend-lines for before and after the red vertical line might have been good; if the graph’s creator makes such a version, I will post it.
Update: Here is is another graph (also from Betawolf on IRC) that may address your questions/concerns:
And the same thing on a log scale: