JMP® Pro 17.0.0 (622753)

Hello, I understand that using Lag in the 1st row results in a missing value. But I need to avoid a missing value, because my predictive algorithm is using Informative Missing elsewhere. So in this one instance, I'd like to avoid it.

I'm not much good with JSL...

Formula Result: want to force this missing value to change to a zero. My initial forays have been trying combinations of If statements using Is Empty, Is Missing. e.g.

If Lag (*the whole formula*) ==Is Empty

Then ==0

Else == Lag (*the whole formula*)

Any suggestions? thanks, Paul

Lag("*the whole formula*")