topic Re: Create a new variable based on value of an obs and name of a variable in SAS Programming

Create a new variable based on value of an obs and name of a variable

alann — Wed, 20 Mar 2019 06:35:48 GMT

I am trying to create a new variable that will be equal to the value of another variable (i.e. any one of X1 through X10). However, which of the X variables it will be set equal to is stored in a separate variable (Near), where the suffixes are stored.

I can actually do this simply with a bunch of if/then data steps. However, since I will probably repeat this for a number of different variables and there are 14 suffixes total, I'd love to find a way to automate it. Here's that simple code, and at the bottom is a sample from the data.

Thank you for any help!

data aaa1;
set aaa;
if near=1801 then las_trd_near=las_trd_1801;

if near=1802 then las_trd_near=las_trd_1802;

if near=1902 then las_trd_near=las_trd_1902;

run;

data WORK.AAA;
infile datalines;
input LAS_TRD_1801:BEST12. LAS_TRD_1802:BEST12. LAS_TRD_1901:BEST12. near:32.;
datalines;
15 25 40 1801
75 26 45 1801
90 20 60 1802
50 30 70 1802
45 40 65 1803
;;;;

Re: Create a new variable based on value of an obs and name of a variable

PeterClemmensen — Wed, 20 Mar 2019 07:54:33 GMT

You can do something like this

data WORK.AAA;
infile datalines;
input LAS_TRD_1801:BEST12. LAS_TRD_1802:BEST12. LAS_TRD_1901:BEST12. near:32.;
datalines;
15 25 40 1801
75 26 45 1801
90 20 60 1802
50 30 70 1802
45 40 65 1803
;;;;

data aaa1;
   set aaa;
   las_trd_near=input(vvaluex(cats('LAS_TRD_', near)), best12.);
run;

@alann, please let me know if this works for you 🙂

Re: Create a new variable based on value of an obs and name of a variable

alann — Wed, 20 Mar 2019 11:22:53 GMT

Thank you so much! It works beautifully.
I love the infinite capabilities of SAS, and hope to get more proficient with using all these different functions.

Re: Create a new variable based on value of an obs and name of a variable

PeterClemmensen — Wed, 20 Mar 2019 13:45:10 GMT

Glad to help 🙂

Well, starting to browse the communities here, you've come a long way already.

Re: Create a new variable based on value of an obs and name of a variable

alann — Wed, 20 Mar 2019 15:41:55 GMT

Thank you! I've been browsing the communities for a while now, and usually can find the solution I need from past posts, but first time posting, it was much more efficient 🙂

It's just I'd love to find a tutorial that would give me an overview of primary useful functions, so I'd know what to search for when I need to use. For example, I knew of cats function but didn't know I could use it to concatenate a string constant with the numeric value of an observation, that's brilliant! I use concatenate function very effectively in Excel (and that's how I can automate writing tons of line of code in SAS, it just doesn't look good), so it'd be great if I can master these skills in SAS. Hopefully, over time, I guess.
Thank you again!