topic Re: MaCRO in SAS Data Management

MaCRO

docsaurmi — Fri, 06 Nov 2015 19:45:37 GMT

Hello, I have 3 excel data sets named data 1,data 2 and data 3 with common variable id. I have imported them using MACRO. I have merged (data 1 ,data 2 and data 3 data 2) in the following way,

%macro merge (factor,m,n);

data &factor;

merge %do i = &m %to &n;

data&i

%end;

;

by id;

run;

proc print data = &factor;

run;

%mend merge;

%merge (combine1, 1,2);

%merge (combine2, 2,3);

Now, I need to solve this

1. merge data 1 and data 2 so that I have records only for those values of ID that are in data 1.

2. merge all three files so that I have records only for those values of ID that are in all 3 datasets.

How can I write the SAS MACRO code for these?

Re: MaCRO

slangan — Fri, 06 Nov 2015 20:11:37 GMT

You should use the IN option:

https://onlinecourses.science.psu.edu/stat481/node/18

Re: MaCRO

Reeza — Fri, 06 Nov 2015 20:34:38 GMT

Why are you doing this via a macro? It seems like a single/simple data step would work?

Re: MaCRO

docsaurmi — Fri, 06 Nov 2015 20:52:35 GMT

How can I use 'in' option in MACRO code?

Re: MaCRO

docsaurmi — Fri, 06 Nov 2015 20:53:41 GMT

I am just trying to use MACRO in this case.

Re: MaCRO

Astounding — Fri, 06 Nov 2015 21:03:11 GMT

This is actually a good exercise to use, to learn more about writing macros.

First, this line in your macro will change:

data&i

Instead, it will add the IN= variables:

data&i (in=in&i)

The other piece that changes is a bit more complex. It will add a statement after the BY statement, to subset observations. It will genereate something like this:

if in1 and in2 and in3;

To do that, all of this code goes between the BY statement and the RUN statement:

%do i=&m to &n;

in&i

%if &i < &n %then and;

%end;

;

Try to match up the pieces of the macro version to the pieces of the hard-coded IF statement.

Good luck.

Re: MaCRO

Patrick — Sat, 07 Nov 2015 03:11:02 GMT

Below should work.

%macro merge (factor,m,n);

  data &factor;
    merge 
      %do i = &m %to &n;
        data&i (in=in&i)
      %end;
      ;
    by id;

    %do i = &m %to &n;
      if in&i;
    %end;

  run;

  proc print data = &factor;
  run;

%mend merge;

%merge (combine1, 1,2);
%merge (combine2, 2,3);