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Geo-
Quartz | Level 8

 to find all numbers that appear at least three times consecutively with data step.


data have;input Id num ;
cards;
1 1
2 1
3 1
4 2
5 1
6 2
7 2

;

IdNum
11
21
31
42
51
62
72
  


+-----------------+For example, given the above Logs table, 1 is the only number that appears consecutively for at least three times.

| ConsecutiveNums |
+-----------------+
| 1               |
+-----------------+

 

1 ACCEPTED SOLUTION

Accepted Solutions
Astounding
PROC Star

While it works for this test data, it does have a flaw.  If the same number appears 5 times in a row, it will output that number 3 times instead of once.  Here's an alternative:

 

data want;

count=0;

do until (last.num);

   set have;

   by num notsorted;

   count + 1;

end;

if count >= 3;

keep num count;

run;

View solution in original post

4 REPLIES 4
RW9
Diamond | Level 26 RW9
Diamond | Level 26

Please once again, refer to how to post a question help.  Post test data in the form of a datstep!

As such:

if lag2(num)=num and lag(num)=num then output;

May work, nothing to test it on as not going to type in test data.

Geo-
Quartz | Level 8
Sir,have updated as what you mentioned.
RW9
Diamond | Level 26 RW9
Diamond | Level 26

Thanks, and I have just tested and appears to work for the given test data:

data have;
  input id num;
cards;
1 1
2 1
3 1
4 2
5 1
6 2
7 2
;
run;

data want (drop=id);
  set have;
  if lag2(num)=num and lag(num)=num then output;
run;
Astounding
PROC Star

While it works for this test data, it does have a flaw.  If the same number appears 5 times in a row, it will output that number 3 times instead of once.  Here's an alternative:

 

data want;

count=0;

do until (last.num);

   set have;

   by num notsorted;

   count + 1;

end;

if count >= 3;

keep num count;

run;

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