topic Creating turnover stats - entries/exits to groups over time in SAS Procedures

Creating turnover stats - entries/exits to groups over time

MGray000 — Mon, 20 Feb 2017 23:33:38 GMT

Hi, I'm wondering if anyone has a suggestion as to how to create variables reflecting the number of entries, exits, and their combination (exits + entries = total turnover) within groups over time. I'm afraid my expertise is too limited.

Below is a snapshot of the data (lefthand columns; variables: Member, Team, Year) and what I'm seeking to capture summarized on the right:

Member	Team	Year		Three Variables to Create: entries, exit, and turnover
Adam	A	2000		First year/baseline - Group A: entries, exits and turnover (= exits + entries) all set to 0
Andrea	A	2000
Ann	A	2000
Bob	A	2000
Jeff	A	2000
Jim	A	2000
Ralph	B	2000		First year/baseline - Group B: entries, exits and turnover (= exits + entries) all set to 0
Sam	B	2000
Sandy	B	2000
Shelly	B	2000
Adam	A	2001		Group A x Year 2001: 0 entries; 0 exits; 0 turnover (= exits + entries)
Andrea	A	2001
Ann	A	2001
Bob	A	2001
Jeff	A	2001
Jim	A	2001
Ralph	B	2001		Group B x Year 2001: 0 entries; 0 exits; 0 turnover (= exits + entries)
Sam	B	2001
Sandy	B	2001
Shelly	B	2001
Adam	A	2002	note: Jeff exited	Group A x Year 2002: 0 entries; 1 exit; 1 turnover (= exits + entries)
Andrea	A	2002
Ann	A	2002
Bob	A	2002
Jim	A	2002
Jessica	B	2002	note: Jessica entered	Group B x Year 2002: 1 entry; 0 exits; 1 turnover (= exits + entries)
Ralph	B	2002
Sam	B	2002
Sandy	B	2002
Shelly	B	2002

Any thoughts or suggestions are greatly appreciated! Cheers!

MGray

Re: Creating turnover stats - entries/exits to groups over time

art297 — Tue, 21 Feb 2017 02:07:47 GMT

Here is one way you could do your calculations:

proc sort data=have;
  by team member year;
run;

proc transpose data=have out=want (drop=_name_);
  by team member;
  var var;
  id year;
run;

data want (drop=i);
  set want;
  array years _2000-_2002;
  by team;
    entry=0;
    exit=0;
  do i=2 to 3;
    if years(i) and missing(years(i-1)) then entry=entry+1;
    else if missing(years(i)) and years(i-1) then exit=exit+1;
  end;
  turnover=entry+exit;
run;

proc means data=want sum;
  var entry exit turnover;
  by team;
run;

Art, CEO, AnalystFinder.com

Re: Creating turnover stats - entries/exits to groups over time

Reeza — Tue, 21 Feb 2017 02:08:38 GMT

I see sample data, please post what the equivalent output should be.

Re: Creating turnover stats - entries/exits to groups over time

mkeintz — Wed, 22 Feb 2017 03:52:44 GMT

I think you can take advantage of proc summary/means ability to find the minimum and maximum years for each team*member. Assuming a member does not leave and return this this works - no sorting required:

proc summary data=have min max nway ;
  class team member;
  var year;
  output out=range min=minyear max=maxyear;
run;

data want (keep=team year entries exits turnover);
  array ent {2000:2002} _temporary_ (3*0);
  array ext {2000:2002} _temporary_ (3*0);
  set range;
  by team ;
  if minyear>2000 then ent{minyear}+1;    /*exclude baseline year from entry counts*/
  if maxyear<2002 then ext{maxyear+1}+1;  /*exclude last data year from exit counts*/
  
  if last.team then do year=2000 to 2002;
    entries=ent{year};  ent{year}=0;
    exits=ext{year};    ext{year}=0;
    turnover=entries+exits;
    output;
  end;
run;

Note the data step accumulates totals for minyear (for entries) and maxyear (for exists) in two arrays (each indexed by year). When the last record for each team is encountered, that array is retrieved and output.

Re: Creating turnover stats - entries/exits to groups over time

MGray000 — Tue, 21 Feb 2017 16:53:46 GMT

Art, thanks so much!
The program produced an output dataset containing one observation per team, with the following variables:
Team EntryExitTurnover
I realize now I erred earlier. My data are longitudinal. Hence, I should have specified the need for yearly entry, exit and turnover stats (i.e., team X year output). My bad! But as it happens, another response produced just that output. So, problem solved!
Again, I can't thank you enough for lending a hand. Cheers!

Re: Creating turnover stats - entries/exits to groups over time

MGray000 — Tue, 21 Feb 2017 16:57:19 GMT

Hi Reeza,
Thanks for your follow-up! Clearly, I erred in not mentioning the need for a longitudinal solution (year X team output). But as it happens, MKeintz posted a solution that produces just that. So, I'm all set. I so appreciate your time. Cheers!

Re: Creating turnover stats - entries/exits to groups over time

MGray000 — Tue, 21 Feb 2017 16:58:46 GMT

Success!! Thank you so much. I'm indebted.
Cheers!