topic Re: How to provide the year based on month in SAS Programming

How to provide the year based on month

Sharath_naik — Thu, 03 Feb 2022 13:32:05 GMT

Hi Team,

Please help me to get year based on month ......

In Below example ...... How to get Excepting output Column

Group Month Expecting output
Abc 11 2021
Abc 12 2021
Abc 1 2022
Abc 2 2022
Abc 3 2022
Abc 4 2022
Abc 5 2022
Abc 6 2022
Abc 7 2022
Abc 8 2022
Abc 9 2022
Abc 10 2022
Abc 11 2022
Abc 12 2022
Abc 1 2023
Abc 2 2023
BVC 12 2021
BVC 1 2022
BVC 2 2022
BVC 3 2022
BVC 4 2022
BVC 5 2022
BVC 6 2022
BVC 7 2022
BVC 8 2022
BVC 9 2022
BVC 10 2022
BVC 11 2022
BVC 12 2022
BVC 1 2023
BVC 2 2023

Re: How to provide the year based on month

PaigeMiller — Thu, 03 Feb 2022 13:48:23 GMT

You can't derive a year from a month without strict rules about how to do this, which you don't explain. Rather than me guess and potentially get it wrong, please explain the logic that creates the expected column.

Re: How to provide the year based on month

andreas_lds — Thu, 03 Feb 2022 14:18:36 GMT

Using first/last, lag-function and assuming that the data is sorted by "Group":

data want;
   set have;
   by Group;
   
   retain Year;
   
   LastMonth = lag(Month);
   
   if first.Group then do;
      Year = 2021;
      LastMonth = Month - 1;
   end;
   
   if Month ^= LastMonth + 1 then do;
      Year = Year + 1;
   end;
   
   drop LastMonth;
run;

Re: How to provide the year based on month

Kurt_Bremser — Thu, 03 Feb 2022 15:42:20 GMT

From your data, this should do it:

data want;
set have;
by group;
if first.group then year = 2021;
if month = 1 then year + 1;
run;