topic Re: MANIPULATING SAS DATES in SAS Programming

Manipulating SAS Dates

robertrao — Tue, 02 Feb 2016 02:33:57 GMT

Hello,

I have two SAS datetimes as shown below:

I have an array of med_Time dates and want to output if med_times was 24 hours/1 day prior to LAB_order_TIME

MED_TIME1 LAB_ORDER_TIME

24JAN2015:20:07:00.000 23JAN2015:05:54:00.000

if ( LAB_ORDER_TIME - MED_TIME) /(60*60) ge 24

I tried this above and not sure if i am doing it right....Would this give me the result i am looking for??

Thanks

Re: MANIPULATING SAS DATES

Reeza — Mon, 01 Feb 2016 22:32:29 GMT

It should, but you should always check. Also, make sure your condition is exactly what you want, ie GE vs GT.

Re: MANIPULATING SAS DATES

FreelanceReinh — Mon, 01 Feb 2016 22:33:15 GMT

Hello @robertrao,

Yes, this should work, provided that your criterion is "at least 24 hours prior to ..."

Re: MANIPULATING SAS DATES

robertrao — Mon, 01 Feb 2016 23:34:25 GMT

Hello ,

Sorry to add this question after having been answered.

I try to do the below and it would not somehow work for me.

Wanted to create a new varibles new_lax{} and new_time{ } for those satisfying my condition.

It would not somehow work. Could you please point out the mistake in the below code.

Thanks a lot

data final;

set orders_lax;

by pat_enc_csn_id; /*multiple records per ID exist*/

array names(*) laxname1-laxname380; /*med names*/

array times(*) $ laxtime1-laxtime380; /*med taken time*/

array new_lax(*) $ new_lax1-new_lax100; /*new variables which satisfied condition*/

j=1;

do i= 1 to 380;

if order_time-times{i} ge 24 then do; /*order_time is a variable existing in dataset */

new_Lax{j}=names{i};

new_time{j}=times{i};

j+1;

end;

drop i j;

end;

run;

Re: MANIPULATING SAS DATES

Reeza — Mon, 01 Feb 2016 23:40:31 GMT

The formula you showed in your question isn't the one you coded in your code above.

Re: MANIPULATING SAS DATES

robertrao — Tue, 02 Feb 2016 05:42:11 GMT

Oops. Sorry about that. Thias code is working fine but its bringing in the ones satisfying the condition as well mas others.

Could you help me grab only those which are satisfying the condition?

Thanks

data final

set orders_lax;

array names(*) laxname1-laxname380; /*med names*/

array times(*) $ laxtime1-laxtime380; /*med taken time*/

array new_lax(*) $ new_lax1-new_lax380; /*new variables which satisfied condition*/

array new_time(*) new_time1-new_time380;

j=1;

do i= 1 to 380;

if order_time-times{i}/60*60 ge 24 then do; /*order_time is a variable existing in dataset */

new_Lax{j}=names{i}; /*condition satisfied*/

new_time{j}=times{i}; /*condition satisfied*/

end;

j+1;

drop i j;

format new_time1-new_time350 datetime.;

end;

run;

Re: MANIPULATING SAS DATES

FreelanceReinh — Tue, 02 Feb 2016 09:25:07 GMT

Your latest correction is still insufficient: You forgot two pairs of parentheses (cf. your first post in this thread):

if (order_time-times{i})/(60*60) ge 24 then do;

Re: Manipulating SAS Dates

robertrao — Tue, 02 Feb 2016 11:56:59 GMT

Hi Freelance, tried adding ,removing those braces but the result would not change...
Thanks

Re: Manipulating SAS Dates

Reeza — Tue, 02 Feb 2016 12:03:09 GMT

Well you don't exclude them anywhere. Try adding an explicit OUTPUT statement or an explicit DELETE.

Re: Manipulating SAS Dates

FreelanceReinh — Tue, 02 Feb 2016 12:56:45 GMT

The inequality with the parentheses means: times{i} was at least 24 hours prior to order_time.

The inequality without parentheses means: times{i} was at least 24 seconds prior to order_time.

Please note that the former inequality implies the latter. That is, if all medication times were at least 24 hours prior to order time, the results would not change indeed, whether you use the correct or the incorrect formula.

But you wrote that your code would be "bringing in the ones satisfying the condition as well mas others." Could you please show us one of those "other" cases?

Also, if you are more comfortable with SAS functions than with mathematical formulas, you could rewrite your IF condition as follows:

if intck('hour', times{i}, order_time, 'c') ge 24 then do;