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proc expand - a problem with converting data from yearly to quarterly

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proc expand - a problem with converting data from yearly to quarterly

Dear all;

I have a dataset with yearly observations that I want to transform to have quarterly frequency.

data have;

  input year country $:1. value;

  datalines;

  2000 A 1

  2001 A 0

  2000 B 1

  2000 B 1

  ;

run;

data have;

  set have;

  format year year4.;

run;

data want;

  input period :$6. country :$1. value;

  datalines;

  2000Q1 A 1

  2000Q2 A 1

  2000Q3 A 1

  2000Q4 A 1

  2001Q1 A 0

  2001Q2 A 0

  2001Q3 A 0

  2001Q4 A 0

  2000Q1 B 1

  2000Q2 B 1

  2000Q3 B 1

  2000Q4 B 1

  2001Q1 B 1

  2001Q2 B 1

  2001Q3 B 1

  2001Q4 B 1

  ;

run;

I've tried to use proc expand in the following way (following SAS documentation to the procedure):

proc expand data=have out=want from=year to=qtr;

  convert value;

  id year;

  by country;

run;

but got the following error message:

ERROR: Duplicate time interval found at observation number 2 in the data set WORK.HAVE,

       according to the FROM=YEAR option and the ID variable values. The current ID is year=2001

       and the previous is year=2000, which are within the same YEAR interval.

       Check that FROM=YEAR is correct for this data set, and that the ID variable year contains

       SAS date or datetime values that correctly identify the observations.

NOTE: Execution is aborted because of invalid ID values or invalid FROM= option.

NOTE: The above message was for the following BY group:

      country=A

ERROR: Observation with duplicate ID value found. The value of the ID variable, year=2000, at

       observation number 4 in data set WORK.HAVE is the same as the previous observation.

What am I doing wrong?

Best,

Chris


Accepted Solutions
Solution
‎01-15-2015 09:31 AM
Super User
Posts: 10,041

Re: proc expand - a problem with converting data from yearly to quarterly

Posted in reply to chris2377

Here is a data step version solution.

data have;
  input year country $:1. value;
  datalines;
  2000 A 1
  2001 A 0
  2000 B 1
  2001 B 1
  ;
run;
data want;
 set have;
 do i=1 to 4 ;
  date=yyq(year,i);
  output;
 end;
 format date yyq.;
 drop i year;
run;

Xia Keshan

View solution in original post


All Replies
Super Contributor
Posts: 340

Re: proc expand - a problem with converting data from yearly to quarterly

Posted in reply to chris2377

You have a typo. Start year and ending year of B is both 2000. There is nothing to interpolate for proc expand.

Contributor
Posts: 60

Re: proc expand - a problem with converting data from yearly to quarterly

Posted in reply to user24feb

Thanks for noting, but it's not the cause. I've corrected the typo and still get the error message

data have;

  input year country $:1. value;

  datalines;

  2000 A 1

  2001 A 0

  2000 B 1

  2001 B 1

  ;

run;

proc expand data=have out=want from=year to=qtr;

  convert value;

  id year;

  by country;

run;

ERROR: Duplicate time interval found at observation number 2 in the data set WORK.HAVE,

       according to the FROM=YEAR option and the ID variable values. The current ID is year=2001

       and the previous is year=2000, which are within the same YEAR interval.

       Check that FROM=YEAR is correct for this data set, and that the ID variable year contains

       SAS date or datetime values that correctly identify the observations.

NOTE: Execution is aborted because of invalid ID values or invalid FROM= option.

NOTE: The above message was for the following BY group:

      country=A

ERROR: Duplicate time interval found at observation number 4 in the data set WORK.HAVE,

       according to the FROM=YEAR option and the ID variable values. The current ID is year=2001

       and the previous is year=2000, which are within the same YEAR interval.

       Check that FROM=YEAR is correct for this data set, and that the ID variable year contains

       SAS date or datetime values that correctly identify the observations.

NOTE: Execution is aborted because of invalid ID values or invalid FROM= option.

NOTE: The above message was for the following BY group:

      country=B

NOTE: There were 4 observations read from the data set WORK.HAVE.

NOTE: The data set WORK.WANT has 0 observations and 3 variables.

NOTE: PROCEDURE EXPAND used (Total process time):

      real time           0.03 seconds

      cpu time            0.03 seconds

Super Contributor
Posts: 340

Re: proc expand - a problem with converting data from yearly to quarterly

Posted in reply to chris2377

You're right. Proc expand requires a date. That caused the error. This would work without errors, but I am afraid there is no interpolation method like you described above.

data have;
  input year country $:1. value;
  YearDate=MDY(1,1,Year); Format YearDate Date9.;
  datalines;
  2000 A 1
  2001 A 0
  2000 B 1
  2001 B 1
  ;
run;

Proc Expand Data=Have Out=Want From=Year To=Qtr;
  Convert value=value_new / Observed=Ending;
  ID YearDate;
  By country;
Run;

Contributor
Posts: 60

Re: proc expand - a problem with converting data from yearly to quarterly

Posted in reply to user24feb

Thanks for help. I didn't notice the problem with date format. Dates in SAS are still tricky for me from time to time.

Best

Solution
‎01-15-2015 09:31 AM
Super User
Posts: 10,041

Re: proc expand - a problem with converting data from yearly to quarterly

Posted in reply to chris2377

Here is a data step version solution.

data have;
  input year country $:1. value;
  datalines;
  2000 A 1
  2001 A 0
  2000 B 1
  2001 B 1
  ;
run;
data want;
 set have;
 do i=1 to 4 ;
  date=yyq(year,i);
  output;
 end;
 format date yyq.;
 drop i year;
run;

Xia Keshan

Contributor
Posts: 60

Re: proc expand - a problem with converting data from yearly to quarterly

Thanks, it gives me what I want.

Best

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