Output missing values based on groups

[SrikanthY]

There are many patid's in my data sets. Each patid contains many rows. comment where the value is missing like in the posted one (attachment).

dataset structure:

2 lbnam's are grouped into one but some lbnames not.

output should be based on patid, visit and lbnam

sample data: and please find attachment for output sholud look like ..

PatID	Visit	lbnam	Group	Value
ID001	1	A	1	21
ID001	1	B	1
ID001	1	C	2
ID001	1	D	2
ID001	1	E	3	11
ID001	1	F	3	22
ID001	2	A	1
ID001	2	C	2	22
ID001	2	D	2	11
ID001	2	E	3	33
ID001	2	F	3	11
ID001	2	G		2
ID001	2	H

[art297]

I think that the following does what you want:

data want (drop=counter nmiss);
  do until (last.group);
    set have;
    by PatID Visit Group notsorted;
    if first.Group then do;
      counter=1;
      nmiss=0;
    end;
    else counter+1;
    if missing(value) then nmiss+1;
  end;
  do until (last.group);
    set have;
    by PatID Visit Group notsorted;
    if nmiss gt 0 and not missing(group)then do;
      if counter eq nmiss and counter gt 1 then comment='Y';
      else comment='N';
    end;
    output;
  end;
run;

Art, CEO, AnalystFinder.com