I'm trying to generate a variable (steponecpn) so that is represents the change in Cumulative Plane Number (cpn) from one month to the next.
I've accomplished this with this code:
Code:
gen steponecpn=cpn-cpn[_n-1]
Problem generating a new variable based on previous values
Hi all,
I'm trying to generate a variable (steponecpn) so that is represents the change in Cumulative Plane Number (cpn) from one month to the next.
I've accomplished this with this code:
The problem that I'm having is that when there isn't a previous value (ex. when cpn[_n-1] = .) I end up with no value in my steponecpn. In these cases, I'd like to have steponecpn = cpn. Does anyone have an idea of how to do this?
I'm trying to generate a variable (steponecpn) so that is represents the change in Cumulative Plane Number (cpn) from one month to the next.
I've accomplished this with this code:
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