How to create an new count variable by ID and Date

sms1891 — Thu, 05 Mar 2020 20:46:59 GMT

Hi all,

I am looking to create a new count variable in the data set using ID and Date variables. Basically I want to count same ID with same Dates as 1 and same IDs with different Date as 2, 3 , etc. based on number of different dates each ID has. I would really appreciate your help!

Thank you so much in advance!

Here is what I want for the count variable:

ID Date Count

1 3/2/2020 1

2 3/3/2020 1

2 3/4/2020 2

2 3/5/2020 3

3 3/2/2020 1

4 3/3/2020 1

4 3/4/2020 2

Re: How to create an new count variable by ID and Date

novinosrin — Thu, 05 Mar 2020 20:52:04 GMT

data have;
input ID     Date   :mmddyy10.;*                     Count;
format date mmddyy10.;
cards;
1      3/2/2020                     1

1      3/2/2020                     1

1      3/2/2020                     1

2      3/3/2020                     1

2      3/4/2020                     2

2      3/5/2020                     3

3     3/2/2020                      1

4     3/3/2020                     1

4     3/3/2020                     1

4     3/4/2020                     2
;

data want;
 set have;
 by id date;
 if first.id then count=1;
 else if first.date then count+1;
run;

topic How to create an new count variable by ID and Date in SAS Programming

How to create an new count variable by ID and Date

Re: How to create an new count variable by ID and Date