topic Re: Data restructuring in SAS Data Management

Data restructuring

walidqerem — Fri, 15 Jul 2016 09:50:59 GMT

Hi all

I am trying to restructure my data and any help will be really appreciated. I have attached four screenshots,2016-07-15.png and 2016-07-15 (1).png show the original data and the rest show how I would like the data to be rearranged. I would do it manually but I have huge data and that would be time consuming

Re: Data restructuring

RahulG — Fri, 15 Jul 2016 09:59:23 GMT

Your problem is not very clear. Please illustrate more so that I can give you solution.

In one png, it is the list of table columns and second one is the actual table. Now I do not understand how do you want to structure your data.

Re: Data restructuring

walidqerem — Fri, 15 Jul 2016 10:25:00 GMT

Thank you for the quick reply

In the original data I have the following variables Patient Id variable, a string variable that contains a drug nme, drug recieved data, strength, repetition, patient age...etc

Example

Patient ID Drug name recieved date strength

1 Cefrriaxone 1/1/2016 500

1 Cefrriaxone 2/1/2016 500

2 Cefaclor 5/6/2016 1000

2 Cefaclor 6/6/2016 1000

And I wanted restructure the data by transforming each different drug name in the drug name variable to a new variable and transform the date to starting date and discontinuation date (1st and last recieved date for each drug for each patient). so the data would look like this

Patient ID Ceftriaxone starting date disc.date strength cefaclor startingdate2 disc.date2 str.2

1 1 1/1/2016 2/1/2016 500 2 n/p

2 2 n/a 1 5/6/2016 6/6/2016 1000

Re: Data restructuring

Reeza — Fri, 15 Jul 2016 10:30:15 GMT

How many drugs do you have?

Re: Data restructuring

walidqerem — Fri, 15 Jul 2016 10:37:34 GMT

Re: Data restructuring

Reeza — Fri, 15 Jul 2016 14:20:10 GMT

I generally don't recommend this data structure. You'll need to know all the drug names for any future analysis.

If you really want it, you can do three proc transposes and merge results.

Another option is to use the macro A better way to flip

http://www.sascommunity.org/wiki/A_Better_Way_to_Flip_(Transpose)_a_SAS_Dataset

Re: Data restructuring

Ksharp — Sat, 16 Jul 2016 07:15:07 GMT

More data would be better.
Check the MERGE skill proposed by Me,Matt,Arthur.T 

http://support.sas.com/resources/papers/proceedings15/2785-2015.pdf





data have;
input PatientID             Drugname   : $20.               recieveddate : $20.      strength;
cards;
1                            Cefrriaxone                      1/1/2016        500
1                            Cefrriaxone                      2/1/2016         500
2                             Cefaclor                          5/6/2016      1000
2                              Cefaclor                        6/6/2016       1000
;
run;
data temp(index=(xx=(PatientID   strength)));
 set have;
 by PatientID   Drugname   strength;
 if first.strength then n=0;
 n+1;
run;
proc sql;
select distinct catt('temp(where=(n=',n,'and PatientID=',PatientID,'and strength=',strength,') 
rename=(recieveddate=',cats(Drugname,'Date',n),'))')
into : merge separated by ' '
 from temp;
quit;
data want;
 merge &merge;
 by PatientID   strength;
 output;
 call missing(of _all_);
 drop Drugname   n;
run;