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as_methodology
Fluorite | Level 6

Hello

 

I have an panel and each month I receive a list of all the persons that were in that panel in a that month.Each obeservation has variable indicating the year and month (yyyymm) as well as an ID. What I am trying to do is to generate a list of observations that have entered or left the panel in any given month.

 

I am very thankful for any ideas/suggestions.

 

 

 

 

3 REPLIES 3
SuryaKiran
Meteorite | Level 14

It all depends on the data you have. Please provide with some sample data.

Thanks,
Suryakiran
as_methodology
Fluorite | Level 6

Hi Suryakiran

 

Thanks for the reply. I don't know if this helps, but this is basically what I have for August 2018:

 

YEAR_MONTHIDCityMore Info
201808180764Eschen
201808332011Eschen
201808901917Eschen
201808849856Vaduz
201808430057Vaduz
201808721939Schaan
20180878890Schaan
201808234806Planken

 

What I tried so far is to create an extra column with month t-1:

YEAR_MONTHYEAR_MONTH_1IDCityMore Info
201808201807180764Eschen
201808201807332011Eschen
201808201807901917Eschen
201808201807849856Vaduz

 

And then using catx to generate an unique month-person identifier for month t and month t-1.

YEAR_MONTHYEAR_MONTH_1IDID_MONTHID_MONTH_1CityMore Info
201808201807180764180764x201808180764x201807Eschen
201808201807332011332011x201808332011x201807Eschen
201808201807901917901917x201808901917x201807Eschen
201808201807849856849856x201808849856x201807Vaduz

 

Then using proc sql to join it up with itself


PROC SQL;
   CREATE TABLE WORK.TEST AS
   SELECT *,
           t2.ONE
      FROM WORK.TEST t1
           LEFT JOIN WORK.TEST t2 ON (t1.YEAR_MONTH = t2.YEAR_MONTH_1);
QUIT;

 

where ONE is a column containing only a 1 for each observation. The idea being that maches will result in a 1, whereas if there was no match it will create a missing value. Technically, it should work, but it hasn't yet. So I was also wonderig whether there would be an easier approach.

 

Thanks a lot already, Simon

as_methodology
Fluorite | Level 6

Update: It works the way I mentioned in my previous post. It's a little tedious but it works.

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