BookmarkSubscribeRSS Feed
Miracle
Barite | Level 11

Hi everyone.

This may be a simple question but I've been struggling for hours to do. The question is I'd like to keep only the earlist available dob for every individual ie from A to B.

Your help is greatly appreaciated! Thanks in advance!

From A

id    childid    dob

1     1            07/08/1980

1     2            04/04/1985

1     3           12/12/1987
2     4            .

2     5            01/02/1990

3     6            .

3     7            .

3     8            25/12/1995

to B

id    childid    dob

1     1            07/08/1980

2     5            01/02/1990

3     8            25/12/1995

12 REPLIES 12
PGStats
Opal | Level 21

data a;
input id    childid    dob :ddmmyy10.;
format dob ddmmyy10.;
datalines;
1     1            07/08/1980
1     2            04/04/1985
1     3           12/12/1987
2     4            .
2     5            01/02/1990
3     6            .
3     7            .
3     8            25/12/1995
;

data B;
do until (last.id);
     set a; by id;
     if missing(firstDob) and not missing(dob) then do;
          firstDob = dob;
          output;
          end;
     end;
drop firstDob;
run;

PG

PG
Miracle
Barite | Level 11

Thanks PG!! Smiley Happy

data_null__
Jade | Level 19

data DOB;

   set a;

   by id;

   where not missing(dob);

   if first.id;

   run;

Miracle
Barite | Level 11

Thanks data_null_!! Smiley Happy

Haikuo
Onyx | Level 15

SQL;

proc sql;

select * from a group by id having dob=min(dob);

quit;

Haikuo

Miracle
Barite | Level 11

Thanks Hai.kuo!! Smiley Happy

Miracle
Barite | Level 11

Much appreciated for all your help guys!! Smiley Happy

Miracle
Barite | Level 11

Hi everyone.

I've tried the ways you all suggested.

However, in order to keep the 1st childid if a woman had twins or all of her childdob missing ie id=4 and 5, I added a datastep with "if first.id". I wonder if this's nessary or such condition can be taken into account without having to write any extra datastep or SAS procedure.

Thanks again in advance!! Smiley Happy

From A

id    childid    dob

1     1            07/08/1980

1     2            04/04/1985

1     3           12/12/1987
2     4            .

2     5            01/02/1990

3     6            .

3     7            .

3     8            25/12/1995

4     9            .

4     10          .

5     11          08/08/1998

5     12          08/08/1998

to B

id    childid    dob

1     1            07/08/1980

2     5            01/02/1990

3     8            25/12/1995

4     9            .

5     11          08/08/1998

PGStats
Opal | Level 21

A simple modification does the trick :

data B;

do until (last.id);

     set A; by id;

     if missing(firstDob) and (last.id or not missing(dob)) then do;

          firstDob = dob;

          output;

          end;

     end;

drop firstDob;

run;

PG

PG
Miracle
Barite | Level 11

Thanks PG for your prompt reply! Smiley Happy

PGStats
Opal | Level 21

You will notice a possible weakness in my solution : it is the last childid that is reported when there are no dob available for a given id. A modification of Reeza's query gives the lowest childid (maybe not the first in the list) :

proc sql;

create table B as

select id, min(childid) as childid, min(dob) as dob format=ddmmyy10.

from (select id, childid, dob from A group by id having dob=min(dob))

group by id;

quit;

PG

PG
Miracle
Barite | Level 11

Thanks PG! Smiley Happy

sas-innovate-2024.png

Join us for SAS Innovate April 16-19 at the Aria in Las Vegas. Bring the team and save big with our group pricing for a limited time only.

Pre-conference courses and tutorials are filling up fast and are always a sellout. Register today to reserve your seat.

 

Register now!

How to Concatenate Values

Learn how use the CAT functions in SAS to join values from multiple variables into a single value.

Find more tutorials on the SAS Users YouTube channel.

Click image to register for webinarClick image to register for webinar

Classroom Training Available!

Select SAS Training centers are offering in-person courses. View upcoming courses for:

View all other training opportunities.

Discussion stats
  • 12 replies
  • 878 views
  • 6 likes
  • 4 in conversation