Eliminating obs

I hope someone can help me with the following:

I like to eliminate the obs when they are greater than age>=ag1 by id. See below for the input set.

id age ag1

1 1 .
1 2 2
1 3 .
2 1 1
2 2 .
2 3 .
3 1 .
3 2 .
3 3 3
3 4 .

I've used the following code already:


data test1;
set test;
by id;
if first.id or not first.id then do;
if age>=ag1 then delete;
end;
run;

But with the code above, all obs were dropped.

Trying this:

data test1;
set test;
by id;
if first.id or not first.id then do;
if age>=ag1 and ag1 ne . then delete;
end;
run;

will result in this:

1 1 .
1 3 .
2 2 .
2 3 .
3 1 .
3 2 .
3 4 .


So all values of age1 are dropped and the missing values if age>age1 are present. What to do?


Thanks for your time in advance!!

With kind regards.,
Wouter
wphupkes@gmail.com

Business / Risk Analyst
wphupkes@gmail.com