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LOLO12
Obsidian | Level 7

Hi All, 

I tried to create a sequence variable based on usubjid treatment visit and epoch. The issue is I can't get this right. 

* data I have; 
data example;
length usubjid pair_sph epoch $20.;
input trtn $ usubjid $ visitnum visit $ epoch $ pair_add $ pair_sph $ ;
datalines;
TRT1 1 1 VISIT1 TRT1-ASSGN1-1 HGH/HGH -3.50/-2.25
TRT1 1 1 VISIT1 TRT1-ASSGN1-1 /HGH /-2.25
TRT1 1 2 VISIT2 TRT1-ASSGN5-1 HGH/ -3.75/
TRT1 1 2 VISIT2 TRT1-ASSGN5-1 /HGH /-2.25
TRT2 1 4 VISIT4 TRT2-ASSGN1-1 / -3.50/0.00
TRT1 2 1 VISIT1 TRT1-ASSGN1-1 HGH/HGH -2.50/-2.50
TRT1 2 2 VISIT2 TRT1-ASSGN5-1 HGH/ -2.75/
TRT2 2 4 VISIT4 TRT2-ASSGN1-1 / -2.50/-0.50
TRT2 2 5 VISIT5 TRT2-ASSGN5-1 / /-1.00
TRT1 3 1 VISIT1 TRT1-ASSGN1-1 HGH/HGH -1.50/-1.50
TRT1 3 2 VISIT2 TRT1-ASSGN5-1 HGH/ -1.25/
TRT2 3 4 VISIT4 TRT2-ASSGN1-1 / 0.50/-1.50
TRT1 4 1 VISIT1 TRT1-ASSGN1-1 / 0.50/-2.00
TRT2 4 4 VISIT4 TRT2-ASSGN1-1 HGH/HGH -1.75/-2.00
;
run;

*data I want; 

usubjid pair_sph epoch trtn visitnum visit pair_add Seq
1 -3.50/-2.25 TRT1-ASSGN1-1 TRT1 1 VISIT1 HGH/HGH 1
1 /-2.25 TRT1-ASSGN1-1 TRT1 1 VISIT1 /HGH 1
1 -3.75/ TRT1-ASSGN5-1 TRT1 2 VISIT2 HGH/ 2
1 /-2.25 TRT1-ASSGN5-1 TRT1 2 VISIT2 /HGH 2
1 -3.50/0.00 TRT2-ASSGN1-1 TRT2 4 VISIT4 / 1
2 -2.50/-2.50 TRT1-ASSGN1-1 TRT1 1 VISIT1 HGH/HGH 1
2 -2.75/ TRT1-ASSGN5-1 TRT1 2 VISIT2 HGH/ 2
2 -2.50/-0.50 TRT2-ASSGN1-1 TRT2 4 VISIT4 / 1
2 /-1.00 TRT2-ASSGN5-1 TRT2 5 VISIT5 / 2
3 -1.50/-1.50 TRT1-ASSGN1-1 TRT1 1 VISIT1 HGH/HGH 1
3 -1.25/ TRT1-ASSGN5-1 TRT1 2 VISIT2 HGH/ 2
3 0.50/-1.50 TRT2-ASSGN1-1 TRT2 4 VISIT4 / 1
4 0.50/-2.00 TRT1-ASSGN1-1 TRT1 1 VISIT1 / 1
4 -1.75/-2.00 TRT2-ASSGN1-1 TRT2 4 VISIT4 HGH/HGH 1
1 ACCEPTED SOLUTION

Accepted Solutions
Tom
Super User Tom
Super User

So you want to restart the counting at FIRST.TRTN instead of FIRST.USUBJID.

data want ;
  set example;
  by usubjid trtn visit epoch;
  if first.trtn then seq=0;
  seq + first.epoch;
run;

 

Tom_0-1712081434279.png

 

 

View solution in original post

8 REPLIES 8
ballardw
Super User

Please describe the rules in words on how the "other variables" are used in creating the sequence.

Tom
Super User Tom
Super User

So assuming by " usubjid treatment visit and epoch" you mean

  by usubjid trtn visit epoch;

And the data is sorted in that order then a simple data step with by group processing should do what you want.

data want ;
  set example;
  by usubjid trtn visit epoch;
  if first.usubjid then seq=0;
  seq + first.epoch;
run;

Result

Tom_0-1712075419834.png

 

Note the results are different for the last observation for USUBJID=1 since for some reason in your example result you but SEQ back to 1 on that observation instead of incrementing it to 3.  Is there some reason that SEQ should be 1 for that observation?

LOLO12
Obsidian | Level 7

not right if trt2 and visit 4 then seq=1; 

Tom
Super User Tom
Super User

@LOLO12 wrote:

not right if trt2 and visit 4 then seq=1; 


Can you please explain what that means?

Do you mean if TRTN is equal to 'TRT2' and VISIT is equal to 'VISIT4' then you want the number to restart with 1?

If so then add this statement just before the RUN statement.

if TRTN='TRT2' and VISIT='VISIT4' then seq=1;
LOLO12
Obsidian | Level 7

we will count again from 0 for trt2  the sequence suppose to start over 

ballardw
Super User

I suggest again: provide the rules in words.

 

If we have to guess this may take forever as you trot out exception after exception.

Not to mention I didn't see any 0 for your sequence in your Want example. So I don't follow this "count from 0".

 


@LOLO12 wrote:

we will count again from 0 for trt2  the sequence suppose to start over 


 

LOLO12
Obsidian | Level 7

I meant start over the count for the second treatment because it is a different treatment. 

 

your table sequence doesn't match with my table .  The second treatment has started with 1 again.  we need to start the count for the trt2. I changed the color below. Hopefully this will help. 

 

usubjid pair_sph epoch trtn visitnum visit pair_add Seq
1 -3.50/-2.25 TRT1-ASSGN1-1 TRT1 1 VISIT1 HGH/HGH 1
1 /-2.25 TRT1-ASSGN1-1 TRT1 1 VISIT1 /HGH 1
1 -3.75/ TRT1-ASSGN5-1 TRT1 2 VISIT2 HGH/ 2
1 /-2.25 TRT1-ASSGN5-1 TRT1 2 VISIT2 /HGH 2
1 -3.50/0.00 TRT2-ASSGN1-1 TRT2 4 VISIT4 / 1
2 -2.50/-2.50 TRT1-ASSGN1-1 TRT1 1 VISIT1 HGH/HGH 1
2 -2.75/ TRT1-ASSGN5-1 TRT1 2 VISIT2 HGH/ 2
2 -2.50/-0.50 TRT2-ASSGN1-1 TRT2 4 VISIT4 / 1
2 /-1.00 TRT2-ASSGN5-1 TRT2 5 VISIT5 / 2
3 -1.50/-1.50 TRT1-ASSGN1-1 TRT1 1 VISIT1 HGH/HGH 1
3 -1.25/ TRT1-ASSGN5-1 TRT1 2 VISIT2 HGH/ 2
3 0.50/-1.50 TRT2-ASSGN1-1 TRT2 4 VISIT4 / 1
4 0.50/-2.00 TRT1-ASSGN1-1 TRT1 1 VISIT1 / 1
4 -1.75/-2.00 TRT2-ASSGN1-1 TRT2 4 VISIT4 HGH/HGH 1
Tom
Super User Tom
Super User

So you want to restart the counting at FIRST.TRTN instead of FIRST.USUBJID.

data want ;
  set example;
  by usubjid trtn visit epoch;
  if first.trtn then seq=0;
  seq + first.epoch;
run;

 

Tom_0-1712081434279.png

 

 

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