How to get these flags under the following scenarios:
Flag = "Y" if meet one of the following scenarios:
1. There is no AVALC = 'N' after the AVALC='Y' then flag should be the last non-missing record .
2. Subject ended with two consecutive missing ADY , then should flag the last AVALC = 'Y' prior to missed ADY.
4. Subject ended with one missing ADY and ADY is the last one, then should flag the last AVALC = 'Y' prior to missed ADY.
data have;
input usubjid $ ADY AVALC $;
datalines;
A 15 Y
A 36 Y
A 57 Y
A 63 Y
A 64 Y
A . N
B 15 Y
B 16 Y
B 17 Y
B . N
B . N
B . N
B 25 N
B . N
B 29 Y
B 30 Y
B 31 Y
B . N
c 17 Y
c 18 Y
c . N
c . N
D 11 Y
D . N
D 13 Y
D 14 Y
D 15 Y
E 1 N
E 2 N
E 3 N
E 4 Y
;
run;
Records: A 64 Y ; B 17 Y;c 18 Y;D 15 Y;E 4 Y are flagged. Thank you so much!
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I try to use the find ti position different AVALC based on the rules, but looks like not a good idea
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