topic Re: Create a discharge date from admission day and length of stay in SAS Programming

Create a discharge date from admission day and length of stay

desireatem — Thu, 11 May 2017 04:44:01 GMT

I have the following data;

ADM	LOS
20111220	0015
20111225	0007
20111226	0022
20111227	0006
20111227	0009
20111227	0025

I want to crest;

NB one is number ie LOS and ADMI is date format

ADMI

LOS

DISCHARGE_DAY=ADMI+LOS

20111220	0015
20111225	0007
20111226	0022
20111227	0006
20111227	0009
20111227	0025
20111229	0004

Then once I have created the discharge variable, I want to change the format of both the ADMI and DISCHARGE_DAY to YYMMDD10. that is the date should be 2012-01-21 not 20120121 as it is.

Re: Create a discharge date from admission day and length of stay

Jagadishkatam — Thu, 11 May 2017 05:24:39 GMT

data have;
input    ADM:yymmdd10. 	LOS;
disc=adm+los;
format ADM disc yymmdd10.;
cards;
20111220 	0015
20111225 	0007
20111226 	0022
20111227 	0006
20111227 	0009
20111227 	0025
;
run;

Re: Create a discharge date from admission day and length of stay

desireatem — Thu, 11 May 2017 05:46:39 GMT

I did this but it didnt work.

data have1;
set have;
DOA = INPUT(ADM, yymmdd10.);
disc=adm+los;
format ADM disc yymmdd10.;
run;

Re: Create a discharge date from admission day and length of stay

desireatem — Thu, 11 May 2017 05:47:46 GMT

I did this but it didnt work;

data have1;
set have;
DOA = INPUT(ADM, yymmdd10.);
disc=DOA+los;
format ADM disc yymmdd10.;
run;

Re: Create a discharge date from admission day and length of stay

Shmuel — Thu, 11 May 2017 05:55:24 GMT

What did you mean by "it did not work" ?

Please post log and results.

Re: Create a discharge date from admission day and length of stay

desireatem — Thu, 11 May 2017 06:00:50 GMT

DOA is character not numeric so, I cannot perform the addition.

174 data day30 ;
175 set day30 ;
176 DOA = INPUT(ADMIT_START_OF_CARE, yymmdd10.);
177 disc=ADMIT_START_OF_CARE+LENGTH_OF_STAY;
178 format ADMIT_START_OF_CARE disc yymmdd10.;
179 run;

NOTE: Numeric values have been converted to character values at the places given by:
(Line):(Column).

Re: Create a discharge date from admission day and length of stay

Jagadishkatam — Thu, 11 May 2017 06:13:02 GMT

data day30 ;set day30 ;
DOA = INPUT(ADMIT_START_OF_CARE, yymmdd10.);
disc=DOA+LENGTH_OF_STAY;
format ADMIT_START_OF_CARE disc yymmdd10.;
run;

Re: Create a discharge date from admission day and length of stay

desireatem — Thu, 11 May 2017 06:15:18 GMT

SAS Output

Obs	DOA	LENGTH_OF_STAY	ADMIT_START_OF_CARE	disc
1	01DEC2020	17	**********	**********
2	02DEC2020	7	**********	**********
3	02DEC2020	2	**********	**********
4	03DEC2020	2	**********	**********
5	02DEC2020	22	**********	**********

Re: Create a discharge date from admission day and length of stay

Shmuel — Thu, 11 May 2017 06:15:44 GMT

If ADMIT_START_OF_CARE is a date, character type, then

DOA = INPUT(ADMIT_START_OF_CARE, yymmdd10.);

will create DOA as numeric.

The note you got relates to:

disc=ADMIT_START_OF_CARE+LENGTH_OF_STAY;

and you get wrong result because it adds LENGTH_OF_STAY to the displayed number (like: 20161120) not the date !

As ADMIT_START_OF_CARE is a chat type, you can't assign it a format yymmdd10.

You probably meant to write:

format DOA disc yymmdd10.;

Re: Create a discharge date from admission day and length of stay

desireatem — Thu, 11 May 2017 06:22:11 GMT

IT is still wrong. I want to have preserve ADMIT_START_OF_CARE variable. Coming up as XXXXXXXX

data day30 ;set day30 ;
DOA = INPUT(ADMIT_START_OF_CARE, yymmdd10.);
disc=DOA+LENGTH_OF_STAY;
*format ADMIT_START_OF_CARE disc yymmdd10.;
format DOA disc ADMIT_START_OF_CARE yymmdd10.;
run;

SAS Output

Obs	DOA	LENGTH_OF_STAY	ADMIT_START_OF_CARE	disc
1	2020-12-01	17	**********	2020-12-18
2	2020-12-02	7	**********	2020-12-09
3	2020-12-02	2	**********	2020-12-04
4	2020-12-03	2	**********	2020-12-05
5	2020-12-02	22	**********	2020-12-24

Re: Create a discharge date from admission day and length of stay

Shmuel — Thu, 11 May 2017 06:36:07 GMT

Change FORMAT line to:

format DOA disc yymmdd10.   ADMIT_START_OF_CARE $8.;

See my previous post.

Re: Create a discharge date from admission day and length of stay

Shmuel — Thu, 11 May 2017 06:53:33 GMT

if ADMIT_START_OF_CARE is a date why is it assigned to CHAR ($) type ?

Assuming you got it from a text file or from excel, change its type and format using:

data have1;
 set have(rename=(ADMIT_START_OF_CARE=datex));
       ADMIT_START_OF_CARE = input(datex, yymmdd8.);
        /* assuming it is yyyymmdd informat */
       format ADMIT_START_OF_CARE yymmdd10.;
run;

then change your code to:

data day30 ;
  set have1 ;
       DOA = ADMIT_START_OF_CARE;
       disc=ADMIT_START_OF_CARE + LENGTH_OF_STAY;
       format DOA ADMIT_START_OF_CARE disc yymmdd10.;
run;

You may drop DOA after having ADMIT_START_OF_CARE a numeric date.

Re: Create a discharge date from admission day and length of stay

Astounding — Thu, 11 May 2017 10:29:59 GMT

If ADM is numeric, the correct conversion formula would be:

ADMI = input(put(ADM,8.), yymmdd8.);

format admi yymmdd10.;

You can still perform math with that. For example:

DISCHARGE_DAY = ADMI + input(LOS, 4.);

format discharge_day yymmdd10.;

I'm assuming that LOS is character since it displays with leading zeros. If it's actually numeric with a permanent Z4 format, you can skip the INPUT function.