visit
week1
week2
week3
week4
week5
new variable days should be created and values in days are multiples of 7
week1 day=7
week2 day=14
week3 day=21 etc.,
The output should be
visit days
week1 7
week2 14
week3 21
week4 28
week5 35
week1 7
week2 14
week3 21
If they are always in order you could do something like this:
data one;
input visit $;
cards;
week1
week2
week3
week4
week5
week1
week2
week3
;
data new;
set one;
if visit='week1' then days=7;
else days+7;
run;
proc print;
run;
day = input(substr(visit,5),best.) * 7;
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