I have a table that shows an ID and two numeric variables, as in the example below:
ID | VAR1 | VAR2 |
ID1 | 20 | 10 |
ID2 | 21 | 11 |
ID3 | 22 | 12 |
I have to add in this table an other column (e.g. TOT) that calculate the difference between var1 to the first row and var2 to the second and so on, as in the example below:
ID | VAR1 | VAR2 | TOT |
ID1 | 20 | 10 | 9 |
ID2 | 21 | 11 | 9 |
ID3 | 22 | 12 | 22 |
Could anyone help me?
Thanks for your assistance.
data want; merge have have(keep=var2 rename=(var2=next_var2) firstobs=2) end=done; if not done then tot=var1-next_var2; drop next_var2; run;
data want; merge have have(keep=var2 rename=(var2=next_var2) firstobs=2) end=done; if not done then tot=var1-next_var2; drop next_var2; run;
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