/* data have */
Class Time_0 Time_1 Time_2
A 1 2 4
B 0 3 9
C 3 6 0
/* data want */
Class _01 _12
A 2 2
B 1 3
C 2 0
Rule 1: In data 'want', column '_01' = column 'Time_1' / 'Time_0' from data 'have'.
'_12' = 'Time_2' / 'Time_1'.
....
Rule 2: If divisor = 0 then result = 1.
Because my actual data have more than 100 'time' columns: Time_0-Time_&Num (Num is a global macro variable), would prefer using a loop rather than hardcode it.
Thanks.
The naming of the new columns might be a little different here. The name is based on the numerator (but not the denominator):
data want;
set have;
array times {0:&num} time_0 - time_#
array ratios {&num} _001 - _#
do i=1 to #
if times{i-1} = 0 then ratios{i)=0;
else ratios{i} = times{i} / times{i-1};
end;
drop i;
run;
If you would like, you can also drop all the TIME variables as well.
The naming of the new columns might be a little different here. The name is based on the numerator (but not the denominator):
data want;
set have;
array times {0:&num} time_0 - time_#
array ratios {&num} _001 - _#
do i=1 to #
if times{i-1} = 0 then ratios{i)=0;
else ratios{i} = times{i} / times{i-1};
end;
drop i;
run;
If you would like, you can also drop all the TIME variables as well.
You are mixing up usage here. Columns names are for identification in the programming, they are not meant to be used as data.
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