topic Re: Select 3 rows for each unique ID in SAS Programming

Select 3 rows for each unique ID

apple — Thu, 02 Mar 2017 07:34:28 GMT

Each unique ID have many different rows of addresses, I want a program to select for each unqiue ID any 3 rows of addressses.

Thank you.

Example of dataset:

ID Address

1 A

1 B

1 C

2 HH

2 KK

2 NN

2 MM

Re: Select 3 rows for each unique ID

LinusH — Thu, 02 Mar 2017 08:42:23 GMT

If the data is sorted as per your example, use data step with BY ID, and use a counter that is re-initiated for each first.ID.

Use explicit output when the counter is <= 3.

Re: Select 3 rows for each unique ID

RW9 — Thu, 02 Mar 2017 09:14:57 GMT

Just a slight alteration of @LinusH answer uses lag to decide if to output or not (saves a variable and line of code):

data have;
  input id  address $;
datalines;
1    A
1    B
1    C
2    HH
2    KK
2    NN
2    MM
;
run;
data want;
  set have;
  by id;
  if first.id or lag(first.id) or lag2(first.id) then output;
run;

Re: Select 3 rows for each unique ID

Ksharp — Thu, 02 Mar 2017 11:01:49 GMT

data have;
  input id  address $;
datalines;
1    A
1    B
1    C
2    HH
2    KK
2    NN
2    MM
;
run;

proc surveyselect data=have out=want sampsize=3;
strata id;
run;