topic Re: user here with a FIRST.var & LAST.var question in SAS Programming

user here with a FIRST.var & LAST.var question

himalayancat — Mon, 11 Jun 2018 17:34:36 GMT

hi all,

i am aware little how first.var and last.var works but i want to assign value to all the var that are not in first.var and last.var but not able.

your help would be appreciated.

Thank you,

data need;
format this;
set have;
by sex;

if first.sex then do;
this='first';
end;

if not
first.sex and last.sex then do;
this='in_betwn';
end;

if last.sex then do;
this='last';
end;

/* */
/* if UPCASE(sex) NE ('F') THEN DO; */
/* YY='ZZ'; */
/* END; */
run;

Re: user here with a FIRST.var & LAST.var question

Astounding — Mon, 11 Jun 2018 17:45:45 GMT

Two easy issues here ...

First, you need to set a length for your new variable. Otherwise it takes its length from "first" and won't be long enough to hold "in_betwn":

length this $ 8;

Second, NOT applies to just one condition. To get it to apply to both, add parentheses:

if not
(first.sex or last.sex) then do;

Re: user here with a FIRST.var & LAST.var question

PaigeMiller — Mon, 11 Jun 2018 17:43:50 GMT

if not first.sex and not last.sex then do;
this='in_betwn';
end;

Re: user here with a FIRST.var & LAST.var question

ballardw — Mon, 11 Jun 2018 17:45:47 GMT

I get a "not valid file type" error attempting to open your pdf.

If the "problem" is that in between values are showing as "in_be" then the issue is that you did not assign a length to the THIS variable and so SAS assigned a length of 5 because the first use of the variable is in: This='first'; and "first" is 5 characters long.

If "this" variable exists in your set Have data set and it has a length other than 5, or is numeric that could cause other issues.

If there is something else then show the results as text and likely show the log from running the code as well.

Re: user here with a FIRST.var & LAST.var question

PGStats — Mon, 11 Jun 2018 18:06:55 GMT

Keep it simple

data need;
set have; by sex;

length this $8;

if first.sex then this='first';
else if last.sex then this='last';
else this='in_betwn';

run;

Re: user here with a FIRST.var & LAST.var question

himalayancat — Mon, 11 Jun 2018 18:15:43 GMT

thank you for quick reply.was looking for what pgstats suggested.

cheers,