Hello,
I have a dataset similar to the below. I need to find the cumulative number of years that a person appears in my dataset, put it in another column in the same data set, say VAR2, and divide VAR1 by that column, which would be VAR3.
Year | personID | VAR1 | VAR2 | VAR3 |
2000 | 1009 | 2 | 3 | 2/3 |
2001 | 1009 | 3 | 3 | 3/3 |
2002 | 1009 | 5 | 3 | 5/3 |
2000 | 1020 | 1 | 4 | 1/4 |
2001 | 1020 | 4 | 4 | 4/4 |
2002 | 1020 | 5 | 4 | 5/4 |
2003 | 1020 | 6 | 4 | 6/4 |
2000 | 1023 | 2 | 2 | 2/2 |
2001 | 1023 | 3 | 2 | 3/2 |
What I have so far:
data want;
set have;
by personID;
if first. personID then num=1;
else num + 1;
run;
This gives me a column, num, that contains number of years that a person appear in my table. But I cannot fidure out how to find max of this column and put it in another column without grouping.
Any help would be greatly appreciated!
Thank you
I'm not sure what you mean about not grouping. I would recommend SQL in this case as it's easier and a single step.
FYI - please post your data as text, preferably a data step. If I can't copy and paste to a decent format I'm NOT typing out your data. Or testing any code since I don't have data.
proc sql;
create table want as
select a.*, count(*) as num_years, var1/num_years as var3
from have as a
group by personID
order by personID, year;
quit;
I'm not sure what you mean about not grouping. I would recommend SQL in this case as it's easier and a single step.
FYI - please post your data as text, preferably a data step. If I can't copy and paste to a decent format I'm NOT typing out your data. Or testing any code since I don't have data.
proc sql;
create table want as
select a.*, count(*) as num_years, var1/num_years as var3
from have as a
group by personID
order by personID, year;
quit;
When using a statistic calculated in the same query it needs a CALCULATED keyword in front.
var1/ CALCULATED num_years as var3
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