Hello everybody;
I ask if there is a method in SAS, which allows to assign a missing value of a variable x in a Table A,
a value y from a table B which contains common values and of course under some conditions, like this for exemple:
Table A:
ID CM NE Rank X
BV012 1 1 1 12.5
BV012 1 1 2 .
BV012 1 1 3 13.0
BV012 11 3 1 .
BV012 11 3 2 13.4
BV012 11 3 3 11.8
BV013 6 2 1 10.9
BV013 6 2 2 09.6
BV013 6 2 3 09.5
BV013 6 2 4 .
BV017 1 1 1 22.1
BV017 1 1 2 17.8
CM=mounth (1,..12)
NE=order activity (1,2 or 3)
Rank=rank (from 1 to 20)
TABLE B: ( common values) given by mounth (CM):
Mounth NE RANK Y
1 1 1 15.5
1 1 2 18.3
1 1 3 17.2
... ... ... ...
1 1 20 03.5
----------------------------------------------
1 2 1 15.8
... ... ... ...
1 2 20 03.4
----------------------------------------------
... ... ... ...
1 3 20 07.3
----------------------------------------------
2 1 1 22.3
... ... ... ...
----------------------------------------------
... ... ... ...
... ... ... ...
----------------------------------------------
12 3 20 05.5
what i want:
if x from table A = "." then x= y from table B for the same mounth=(1,2,...12), for the same NE=(1,2,3) and for the same Rank = (1,2,... 20).
I did it but it was a very long code. Is there a shorter method with proc sql for exemple.
thanks.
The way to do this is to merge to the two datasets by the common variables, then use the coalesce function to take the first non missing:
proc sql; create table WANT as select A.COMMON_VAR, COALESCE(A.VAR,B.VAR) as VAR from FIRST A left join SECOND B on A.COMMON_VAR=B.COMMON_VAR; quit;
This will take A.VAR if it is not null, otherwise B.VAR.
UPDATE . If table is big ,Try Hash Table.
data table_a;
input ID $ CM NE Rank X;
cards;
BV012 1 1 1 12.5
BV012 1 1 2 .
BV012 1 1 3 13.0
BV012 11 3 1 .
BV012 11 3 2 13.4
BV012 11 3 3 11.8
;
run;
data table_b;
input Mounth NE RANK Y;
cards;
1 1 1 15.5
1 1 2 18.3
1 1 3 17.2
;
run;
data want;
update table_b(rename=(Mounth=CM Y=X)) table_a(in=ina);
by CM NE Rank ;
if ina;
run;
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