topic Re: Deriving Epoch in SAS Programming

Deriving Epoch

Vahe_Mar — Thu, 07 Dec 2017 10:46:31 GMT

Hi All,

I need merge two datas, and take right variable from second data.

first one my main data , second one data which have 3 answers for every subject. how we can merge it using sql in sas or sas.

Example

DATA A DATA B

USUBJID DATE USUBJID STARTDATE ENDDATE EPOCH

1.001 10/10/17 1.001 09/10/17 14/10/17 SCREENING

2.001 15/10/17 15/12/17 TREATMENT

3.001 20/12/17 10/12/18 FOLLOW-UP

So need to check where is my date and take EPOCh for SCREENING for this example.

THANKS

Re: Deriving Epoch

Kurt_Bremser — Thu, 07 Dec 2017 10:56:53 GMT

select a.usubjid, a.date, b.epoch
from data_a a, data_b b
where a.usubjid = b.usubjid and b.startdate <= a.date <= b.enddate
;

In SAS proc sql

Re: Deriving Epoch

Vahe_Mar — Thu, 07 Dec 2017 10:59:10 GMT

there is one problem for screening should be <= date< , for treatment <= date<=, and for follow up <date <=

Re: Deriving Epoch

Kurt_Bremser — Thu, 07 Dec 2017 11:08:17 GMT

Then you Need to supply usable example datasets (in datasteps, see https://communities.sas.com/t5/SAS-Communities-Library/How-to-create-a-data-step-version-of-your-data-AKA-generate/ta-p/258712). Post those datasteps according to https://communities.sas.com/t5/Getting-Started/How-to-add-SAS-syntax-to-your-post/ta-p/224394/jump-to/first-unread-message.

Then also post a visual example of the result expected from those datasets.

Re: Deriving Epoch

Vahe_Mar — Thu, 07 Dec 2017 11:23:47 GMT

I think example is fine

Re: Deriving Epoch

Kurt_Bremser — Thu, 07 Dec 2017 12:54:36 GMT

Then I won't be able to help you.

@Vahe_Mar wrote:

I think example is fine

Re: Deriving Epoch

Vahe_Mar — Thu, 07 Dec 2017 14:19:19 GMT

great

Re: Deriving Epoch

Vahe_Mar — Tue, 12 Dec 2017 11:07:13 GMT

I solved problem with this.

*Derive EPOCH*;
proc sql noprint;
create table epoch as
select a.* ,b.epoch
from faf1 as a left join sds.se as b
on a.usubjid=b.usubjid and
(
(length(a.FADTC)=10 and length(b.SESTDTC)=10 and b.SESTDTC<=a.FADTC)
and
(length(a.FADTC)=10 and length(b.SEENDTC)=10 and a.FADTC<=b.SEENDTC)
and
TAETORD =2

or

(length(a.FADTC)=10 and length(b.SESTDTC)=10 and b.SESTDTC<=a.FADTC)
and
(length(a.FADTC)=10 and length(b.SEENDTC)=10 and a.FADTC<b.SEENDTC)
and
TAETORD =1
)
order by a.usubjid, a.facat, a.fascat, a.faobj
;
quit;

Re: Deriving Epoch

mkeintz — Tue, 12 Dec 2017 14:54:02 GMT

@Vahe_Mar:

Your smug reply to @Kurt_Bremser in declining to provide a usable data set might be a little more sustainable if your solution below actually used variable names you provided in your original topic entry (also below). And there is nothing in the original post that would lead one to see a need for the LENGTH functions.

I'm glad you solved your problem, but it would be good for later viewers to see your proc sql code marked as the solution, and the problem description revised to make the solution apparent.

original message:

Hi All,

I need merge two datas, and take right variable from second data.

first one my main data , second one data which have 3 answers for every subject. how we can merge it using sql in sas or sas.

Example

DATA A DATA B

USUBJID DATE USUBJID STARTDATE ENDDATE EPOCH

1.001 10/10/17 1.001 09/10/17 14/10/17 SCREENING

2.001 15/10/17 15/12/17 TREATMENT

3.001 20/12/17 10/12/18 FOLLOW-UP

So need to check where is my date and take EPOCh for SCREENING for this example.

Your solution:

solved problem with this.

*Derive EPOCH*;
proc sql noprint;
create table epoch as
select a.* ,b.epoch
from faf1 as a left join sds.se as b
on a.usubjid=b.usubjid and
(
(length(a.FADTC)=10 and length(b.SESTDTC)=10 and b.SESTDTC<=a.FADTC)
and
(length(a.FADTC)=10 and length(b.SEENDTC)=10 and a.FADTC<=b.SEENDTC)
and
TAETORD =2

or

(length(a.FADTC)=10 and length(b.SESTDTC)=10 and b.SESTDTC<=a.FADTC)
and
(length(a.FADTC)=10 and length(b.SEENDTC)=10 and a.FADTC<b.SEENDTC)
and
TAETORD =1
)
order by a.usubjid, a.facat, a.fascat, a.faobj
;
quit;