Include f(0) = 0 observation option

[adamesalles]

It is theoretically plausible and frees us from having one more observation.

[adamesalles]

I thought about this recently. We do have a f(0) observation on every dataset.

Of course, statistically, we can have more than one observation considering that f(0) is a random variable, but that would never be the case for the scenarios we are eager to approach.