topic Re: Reshape from wide to long in SAS Programming

Reshape from wide to long

m1986MM — Sat, 19 Mar 2016 00:21:56 GMT

Hi everyone,

I have a wide dataset similar to following table and want to reshape it to long. Variables' formats: name (character), date(date), new_id and original_id(numeric)

name

Date1

New_id1

Cert_id1

Date2

New_id2

Cert_id2

The columns continue to 5.

I used the following code, however it doesn't work and I think the reason is the different formats I have.

DATA long;

SET wide;

ARRAY adate(1:5) date1 - date5 ;

ARRAY anew_id(1:5) new_id1 - new_id5;

ARRAY aoriginal_id(1:5) original_id1 - original_id5;

DO change = 1 to 5 ;

date = adate(change);

new_id =anew_id(change);

original_id =aoriginal_id(change);

OUTPUT;

END;

DROP date1 - date5 new_id1 - new_id5 original_id1 - original_id5;

RUN;

I appreciate any and all suggestions.

Re: Reshape from wide to long

Reeza — Sat, 19 Mar 2016 01:20:27 GMT

Your code appears correct to the naked eye, and your methodology is correct.

As long as type are the same for the same variable groups that shouldn't be an issue either.

Please post your log and explain how it's not working.

Re: Reshape from wide to long

m1986MM — Sat, 19 Mar 2016 01:45:19 GMT

The log window looks fine.

NOTE: There were 263872 observations read from the data setWORK.WIDE.

NOTE: The data set WORK.LONG has 1319360 observations and 5 variables.

NOTE: DATA statement used (Total process time): real time 0.11 seconds cpu time 0.10 seconds

However in the newe table values are not correct. For example, the new date variable does not contain date values anymore. It's not even date format, YYMMDD10.

In the following link, example 5, explains the reshaping with a string variable.

http://www.ats.ucla.edu/stat/sas/modules/widetolong_data.htm

Because of this I assumed that format of the date vriable is problematic. However, I don't know why it should be the case when the type of variable (date) is numeric. (its format is YYMMDD10.)

Re: Reshape from wide to long

PGStats — Sat, 19 Mar 2016 03:49:07 GMT

The new date variavle doesn't have a format. Just give it a date format with the statement

format date yymmdd10.;

Re: Reshape from wide to long

m1986MM — Sat, 19 Mar 2016 05:49:59 GMT

Thanks.