topic Re: Back dating comparsion in SAS Programming

Back dating comparsion

MingZuo — Wed, 05 Dec 2018 10:47:08 GMT

Hi experts,

i am trying to create a new column (Value 2) that is backdated by 1 month in the excel dataset. Is there an easier way to do this in SAS programming/ SAS Data Preparation on Viya? I believe in excel it can be achieved using a look up. Does SAS provide a similar option?

Thanks!

Re: Back dating comparsion

PeterClemmensen — Wed, 05 Dec 2018 11:56:53 GMT

Welcome to the SAS community 🙂

If you can provide example data in the form of a data step, we can provide usable code for your problem

Re: Back dating comparsion

Kurt_Bremser — Wed, 05 Dec 2018 13:19:22 GMT

Try something like this:

proc sort data=have;
by group year month;
run;

data want;
set have;
by group;
prev_year = lag(year);
prev_month = lag(month);
value_2 = lag(value);
if first.group
then do;
  prev_year = .;
  prev_month = .;
  value_2 = .;
end;
run;

proc sort data=want;
by year month group;
run;

Re: Back dating comparsion

MingZuo — Thu, 06 Dec 2018 08:01:12 GMT

Hi,

thanks for the solution, it works!

Last but most importantly, i wish to create the same column of "value" in the same manner in SAS Visual Analytics. Are there any means to use the Aggregated (Periodic) in the calculated item to create?

i want to visualize the comparison in VA, to be something like this below.

Thanks again!

Re: Back dating comparsion

Kurt_Bremser — Thu, 06 Dec 2018 08:08:52 GMT

You better ask this question in the Visual Analytics community. I have no experience with VA myself.

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