continuous period with a gap

JDonovan — Mon, 22 Jan 2018 18:50:58 GMT

I am looking for some help on creating a macro that will identify continuous enrollment with a given gap. For example, we will allow a month gap and still allow continuous enrollment. The data structure I have is....

Memb_id enroll_yrmo (number - not date)

1 201701

1 201702

1 201703

1 201704

1 201705

...

1 201712

I have done this before but it was with from and thru dates with a single record per member. Now, I have a record for every month and it isn't even a date. It is a number. I would love your help and input.

Re: continuous period with a gap

Astounding — Mon, 22 Jan 2018 19:02:45 GMT

Here's one approach, assuming your data set is already sorted:

data want;

set have;

by memb_id;

dif_date = dif(enroll_yrmo);

month = mod(enroll_yrmo, 100);

if first.memb_id then do;

group=1;

return;

end;

if month > 1 and dif_date=1 then return;

if month=1 and dif_date=89 then return;

group + 1;

run;

Since you described the result, but didn't illustrate it, here's what this is doing. It assumes that a "gap" means that a year/month is missing from the sequence (for the same value of MEMB_ID). It creates a new variable (GROUP) that is 1 for the first set of sequential observations, but increases whenever a gap is found.

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continuous period with a gap

Re: continuous period with a gap