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paddyb
Quartz | Level 8

I tried self join but its not working.can anyone tell me how to convert it 1 obs per usubjid

 

obs usubjid wt wtu temp tempu

1     100      70  kg

2     100                 34       c

3     101      77  kg

4     101                 30       c

 

 

 

1 ACCEPTED SOLUTION

Accepted Solutions
Urban_Science
Quartz | Level 8

I know you said you tried a self join, but using proc sql I think it should work.  The code would look something like this:

PROC SQL;
  CREATE TABLE WORK.EXAMPLE AS 
     SELECT A.usubjid
        , A.wt
        , A.wtu
        , B.temp
        , B.tempu
      FROM <table> AS A
      INNER JOIN <table> AS B
        ON A.usubjid = B.usubjid
      WHERE A.wt IS NOT NULL
        AND b.TEMP IS NOT NULL
      ;
QUIT;

There might be prettier solutions, but this should get you on your way.  Good luck!

View solution in original post

6 REPLIES 6
Urban_Science
Quartz | Level 8

I know you said you tried a self join, but using proc sql I think it should work.  The code would look something like this:

PROC SQL;
  CREATE TABLE WORK.EXAMPLE AS 
     SELECT A.usubjid
        , A.wt
        , A.wtu
        , B.temp
        , B.tempu
      FROM <table> AS A
      INNER JOIN <table> AS B
        ON A.usubjid = B.usubjid
      WHERE A.wt IS NOT NULL
        AND b.TEMP IS NOT NULL
      ;
QUIT;

There might be prettier solutions, but this should get you on your way.  Good luck!

art297
Opal | Level 21

In a datastep, just use the update statement:

 

data want;
  update have (obs=0) have;
   by usubjid;
run;

Art, CEO, AnalystFinder.com

 

Note: Modified to incorporate @Astounding's correction

 

Astounding
PROC Star

Art's suggestion is a good approach (assuming your data set is sorted), but requires a slight modification:

 

data want;

update have (obs=0) have;

by usubjid;

run;

Urban_Science
Quartz | Level 8

That's a cleaver use of update. Thanks for the other method!

paddyb
Quartz | Level 8

Thanks.Never thought using update its so easy:)

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