Finding new versus repeated users in sas - sas

Question

Below given dataset I am trying to find New Users Vs Repeated Users.
DATE ID Unique_Event
20200901 a12345 1
20200902 a12345 1
20200903 b12345 1
20200903 a12345 1
20200904 c12345 1
In the above dataset, since a12345 appeared on multiple dates, should be counted as a "repeated" user whereas b12345 only appeared once, so he is a "new" user. Please note, this is only sample data as the actual data is quite large. I tried the below code, but I am not getting the correct count. Ideally, tot_num_users-num_new_users should be repeated users, but I am getting incorrect counts. Am I missing something?
Expected Output:
Month new_users repeated_users
9 2 1
Code:
data user_events;
set user_events;
new_date=input(date,yymmdd10.);
run;
proc sql;select month(new_date) as mm,
count(distinct vv.id) as total_num_users,
count(distinct case when v.new_date = vv.minva then v.id end) as num_new_users,
(count(distinct vv.id) - count(distinct case when v.new_date = vv.minva then id end)
) as num_repeated_users
from user_events v inner join
(select t.id, min(new_date) as minva
from user_events t
group by t.id
) vv
on v.id = vv.id
group by 1
order by 1;quit;

Answer 1

In a sub-select, for each ID you can count the number of distinct DATE to determine the new / repeated status. The all ids aggregate computations are made from the sub-select.
proc sql;
create table freq as
select
count(*) as id_count
, sum (status='repeated') as id_repeated_count /* sum counts a logic eval state */
, sum (status='new') as id_new_count
from
( select
id
, case
when count(distinct date) > 1 then 'repeated'
else 'new'
end as status
from
user_events
group by
id
) as statuses
;

Answer 2

An alternative solution not using proc sql (though I'm aware you tagged this with "proc sql").
data final;
set user_events;
Month=month(new_date);
run;
proc sort data=final; by Month ID;
data final;
set final;
by Month ID;
if first.Month then do;
new_users=0;
repeated_users=0;
end;
if last.ID then do;
if first.ID then
new_users+1;
else
repeated_users+1;
end;
if last.Month then
output;
keep Month new_users repeated_users;
run;

Answer 3

Since you are using proc sql, this is a sql question, not a SAS question.
Try something like:
proc sql;
select ID,count(Unique_Event)
from <that table>
group by ID
order by ID
run;