topic Re: re: create multiple observations from single observations in SAS Programming

re: create multiple observations from single observations

twildone — Thu, 26 Apr 2018 15:14:21 GMT

Hi....I am trying to create multiple observations from each observation IF the Completion Date is in the next Academic Year. The Academic Year is from July 1 to the following June 30. The creation of another observation would stop when the Completion Date is in the final Academic Year, for example, for StudentUID's 12065 and 13687, the students are enrolled over 3 Academic Years. Any suggestions would be greatly appreciated...Thanks

data sets2;
    length StudentUID 8 Programs $ 22 EnrollmentStatus $ 16 RegisterStatus $ 15 TermCalendarID 8 StartDate $ 10 CompletionDate $ 10 ;
    input StudentUID : BEST32. Programs : $CHAR22. EnrollmentStatus : $CHAR16. RegisterStatus : $CHAR15. TermCalendarID : BEST32. StartDate : $CHAR10. CompletionDate : $CHAR10. ;
datalines;
785 CulinaryArts PostSecondary PostSec 108 2015-09-10 2016-06-17
2774 Autobody PostSecondary PostSec 108 2015-09-10 2017-06-15
10543 CulinaryArts PostSecondary PostSec 85 2013-07-02 2015-06-20
11609 Carpentry PostSecondary PostSec 85 2013-07-02 2014-06-20
12064 Hairstyling PostSecondary PostSec 108 2016-02-01 2017-06-17
12065 Automotive PostSecondary PostSec 122 2016-02-01 2018-06-22
13687 CulinaryArts PostSecondary PostSec 85 2013-09-05 2016-06-20
13855 Automotive PostSecondary PostSec 103 2015-02-03 2015-06-19
15258 Autobody Secondary PTSD 85 2013-07-02 2014-06-20
;
run;

Want:

StudentUID	Programs	EnrollmentStatus	RegisterStatus	TermCalendarID	StartDate	CompletionDate
785	CulinaryArts	PostSecondary	PostSec	108	2015-09-10	2016-06-17
2774	Autobody	PostSecondary	PostSec	108	2015-09-10	2016-06-30
2774	Autobody	PostSecondary	PostSec	108	2016-07-01	2017-06-15
10543	CulinaryArts	PostSecondary	PostSec	85	2013-07-02	2014-06-30
10543	CulinaryArts	PostSecondary	PostSec	85	2014-07-01	2015-06-20
11609	Carpentry	PostSecondary	PostSec	85	2013-07-02	2014-06-20
12064	Hairstyling	PostSecondary	PostSec	108	2016-02-01	2016-06-30
12064	Hairstyling	PostSecondary	PostSec	108	2016-07-01	2017-06-17
12065	Automotive	PostSecondary	PostSec	122	2016-02-01	2016-06-30
12065	Automotive	PostSecondary	PostSec	122	2016-07-01	2017-06-30
12065	Automotive	PostSecondary	PostSec	122	2017-07-01	2018-06-22
13687	CulinaryArts	PostSecondary	PostSec	85	2013-09-05	2014-06-30
13687	CulinaryArts	PostSecondary	PostSec	85	2014-07-01	2015-06-30
13687	CulinaryArts	PostSecondary	PostSec	85	2015-07-01	2016-06-20
13855	Automotive	PostSecondary	PostSec	103	2015-02-03	2015-06-19
15258	Autobody	Secondary	PTSD	85	2013-07-02	2014-06-20

Re: re: create multiple observations from single observations

Astounding — Thu, 26 Apr 2018 15:54:28 GMT

Here's a suggestion about where to begin.

You need to learn about how SAS handles dates. What you want is not possible when you read in dates as character strings.

Re: re: create multiple observations from single observations

novinosrin — Thu, 26 Apr 2018 19:05:02 GMT

data sets2;
    length StudentUID 8 Programs $ 22 EnrollmentStatus $ 16 RegisterStatus $ 15 TermCalendarID 8 StartDate 8 CompletionDate 8 ;
    input StudentUID : BEST32. Programs : $CHAR22. EnrollmentStatus : $CHAR16. RegisterStatus : $CHAR15. TermCalendarID : BEST32. StartDate :yymmdd10. CompletionDate : yymmdd10. ;
	format StartDate yymmdd10. CompletionDate  yymmdd10. ;
datalines;
785 CulinaryArts PostSecondary PostSec 108 2015-09-10 2016-06-17
2774 Autobody PostSecondary PostSec 108 2015-09-10 2017-06-15
10543 CulinaryArts PostSecondary PostSec 85 2013-07-02 2015-06-20
11609 Carpentry PostSecondary PostSec 85 2013-07-02 2014-06-20
12064 Hairstyling PostSecondary PostSec 108 2016-02-01 2017-06-17
12065 Automotive PostSecondary PostSec 122 2016-02-01 2018-06-22
13687 CulinaryArts PostSecondary PostSec 85 2013-09-05 2016-06-20
13855 Automotive PostSecondary PostSec 103 2015-02-03 2015-06-19
15258 Autobody Secondary PTSD 85 2013-07-02 2014-06-20
;
run;

data want;
set sets2;
_CompletionDate=CompletionDate;
_k=year(_CompletionDate)-year(startdate);
if _k=1 then do;
	if StartDate<mdy(6,30,year(StartDate)) then do;
	CompletionDate=mdy(6,30,year(StartDate));
	output;
	StartDate=CompletionDate+1;
	CompletionDate=_CompletionDate;
	output;
	end;
	else output;
end;
else if _k>1 then do;
do n=year(StartDate) to year(_CompletionDate)-1;
	if n=year(StartDate) then 
	do;
		if StartDate<mdy(6,30,n) then do;
		CompletionDate=mdy(6,30,n);
		output;
		StartDate=CompletionDate+1;
		CompletionDate=mdy(6,30,n+1);
		output;
		end;
		else do; CompletionDate=mdy(6,30,n+1);output;end;
	end;
	else if year(StartDate)<n<year(_CompletionDate)-1 then 
	do;
		startdate=mdy(7,1,n);
		CompletionDate=mdy(6,30,n+1);
		output;
	end;
	else if n=year(_CompletionDate)-1 then 
	do;
		startdate=mdy(7,1,n);CompletionDate=_CompletionDate;
		output;
	end;
end;
end;
else output;
drop n _:;
run;

Re: re: create multiple observations from single observations

twildone — Thu, 26 Apr 2018 19:08:30 GMT

Hi Novinosrin....It worked perfectly...thanks for your Help.....

Re: re: create multiple observations from single observations

novinosrin — Thu, 26 Apr 2018 19:11:33 GMT

@twildone My eyesight today hasn't been the best due to lack of enough sleep last night and consequently I am not in good form. Therefore, please do test thoroughly and let me know for further edit/changes if any. Once i feel better, I will review again later to make it concise or better. Have a great afternoon

Re: re: create multiple observations from single observations

art297 — Thu, 26 Apr 2018 19:11:39 GMT

While @novinosrin's code assumes that you can re-input your starting file, inputting dates as dates rather than character strings, the following does the task with the data as you originally showed it:

data sets2;
  length StudentUID 8 Programs $ 22 EnrollmentStatus $ 16 RegisterStatus $ 15 TermCalendarID 8 StartDate $ 10 CompletionDate $ 10 ;
  input StudentUID : BEST32. Programs : $CHAR22. EnrollmentStatus : $CHAR16. RegisterStatus : $CHAR15. TermCalendarID : BEST32. StartDate : $CHAR10. CompletionDate : $CHAR10. ;
  datalines;
785 CulinaryArts PostSecondary PostSec 108 2015-09-10 2016-06-17
2774 Autobody PostSecondary PostSec 108 2015-09-10 2017-06-15
10543 CulinaryArts PostSecondary PostSec 85 2013-07-02 2015-06-20
11609 Carpentry PostSecondary PostSec 85 2013-07-02 2014-06-20
12064 Hairstyling PostSecondary PostSec 108 2016-02-01 2017-06-17
12065 Automotive PostSecondary PostSec 122 2016-02-01 2018-06-22
13687 CulinaryArts PostSecondary PostSec 85 2013-09-05 2016-06-20
13855 Automotive PostSecondary PostSec 103 2015-02-03 2015-06-19
15258 Autobody Secondary PTSD 85 2013-07-02 2014-06-20
;
run;

data want (drop=i SDate CDate _:);
  set sets2 (rename=(startdate=_startdate completiondate=_completiondate));
  format StartDate CompletionDate yymmdd10.;
  SDate=input(_StartDate,yymmdd10.);
  CDate=input(_CompletionDate,yymmdd10.);
  do i=1 to intck('year.7', SDate, CDate)+1;
    if i eq 1 then do;
      StartDate=SDate;
      if i ne intck('year.7', SDate, CDate)+1 then do;
        if month(SDate) lt 7 then
         CompletionDate=mdy(6,30,year(SDate));
        else CompletionDate=mdy(6,30,year(SDate)+1);
      end;
      else CompletionDate=CDate;
    end;
    else do;
      StartDate=mdy(7,1,year(CompletionDate));
      if i ne intck('year.7', SDate, CDate)+1 then
       CompletionDate=mdy(6,30,year(StartDate)+1);
      else CompletionDate=CDate;
    end;
    output;
  end;
run;

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