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SURIM
Obsidian | Level 7

I want to do a cohort analysis, this is the result I want:

 

ID    DATE               PURCHASE    COHORT_DATE

12    2018-01-01            1                    2018Q1

12    2018-02-03            2                    2018Q1

15    2018-10-09            1                    2018Q4

25    2019-04-02            1                    2019Q2

37    2018-02-02            1                    2018Q1

37    2019-05-14            2                    2018Q1

 

I use this code:

 

data cohort1;
set cohort;
purchase+1;
if first.id then purchase = 1;
if purchase=1 then cohort_date=date;
by id;
format cohort_date yyq.;
run;

 

And now it looks like this:

 

ID    DATE               PURCHASE    COHORT_DATE

12    2018-01-01            1                    2018Q1

12    2018-02-03            2                    .

15    2018-10-09            1                    2018Q4

25    2019-04-02            1                    2019Q2

37    2018-02-02            1                    2018Q1

37    2019-05-14            2                    .

 

QUESTION: How do I add the same cohort_date for all same id:s?

1 ACCEPTED SOLUTION

Accepted Solutions
PeterClemmensen
Tourmaline | Level 20

Ok. Use Retain Statement like this

 

data cohort;
input ID DATE :yymmdd10.;
format DATE yymmdd10.;
datalines;
12 2018-01-01
12 2018-02-03
15 2018-10-09
25 2019-04-02
37 2018-02-02
37 2019-05-14
;

data cohort1;
   set cohort;
   by id;
   purchase+1;
   if first.id then do;
      purchase = 1;
      cohort_date=date;
   end;
   retain cohort_date;
   format cohort_date yyq.;
run;

View solution in original post

5 REPLIES 5
PeterClemmensen
Tourmaline | Level 20

When you say you want to add "the same" cohort date for all similar id's, what date do you want to add? The first date for each id?

 

SURIM
Obsidian | Level 7

I want to add the first cohort_date (based on first transaction date) for each id. Where there now is a "."

PeterClemmensen
Tourmaline | Level 20

Ok. Use Retain Statement like this

 

data cohort;
input ID DATE :yymmdd10.;
format DATE yymmdd10.;
datalines;
12 2018-01-01
12 2018-02-03
15 2018-10-09
25 2019-04-02
37 2018-02-02
37 2019-05-14
;

data cohort1;
   set cohort;
   by id;
   purchase+1;
   if first.id then do;
      purchase = 1;
      cohort_date=date;
   end;
   retain cohort_date;
   format cohort_date yyq.;
run;
SURIM
Obsidian | Level 7
Ahh, that's it. Thanks a million!
PeterClemmensen
Tourmaline | Level 20

Glad you found your answer 🙂

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