data a;
input name $ group @@;
retain name2;
if group = 1 then name2 = name;
cards;
zhang 1
. 2
. 3
li 1
wang 1
sun 1
. 2
. 3
. 4
;
run;
proc print;
run;
| Obs | name | group | name2 |
|---|---|---|---|
| 1 | zhang | 1 | zhang |
| 2 | 2 | zhang | |
| 3 | 3 | zhang | |
| 4 | li | 1 | li |
| 5 | wang | 1 | wang |
| 6 | sun | 1 | sun |
| 7 | 2 | sun | |
| 8 | 3 | sun | |
| 9 | 4 | sun |
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