topic Re: Case-control Matching with Multiple data sets in SAS Programming

Case-control Matching with Multiple data sets

Pabster — Thu, 14 Mar 2019 14:41:09 GMT

Hi all.
I posted this question before but apparently it looks more like a case of random case-control sampling.

So my data looks like this(Active companies):

and like this (inactive companies):

I need SAS to randomly select an ACTIVE(so the COSTAT of the company =0) company from the Active data set and pair it to an Inactive company(COSTAT=1) from my second data set.
The pairing only has two constraint:
the active company must be in the same industry as the inactive one (same SIC) and the same Fyear for proper analysis.

Afterwards any Inactive company that has no match should deleted.

My final set should look somehow like this:

DATADATE FYEAR DLRSN CONM DLDTE COSTAT SICH

03/12/1992 1989 . A 0 112

03/12/1993 1989 02 B 1990 1 112

03/12/1994 1990 . D 0 333

03/12/1992 1990 03 F 1992 1 333

03/12/1993 1994 . J 0 445

03/12/1994 1994 03 L 1996 1 445

03/12/1998 1998 . I 0 001

03/12/1998 1998 02 Z 2000 1 001

Hope it`s clear and you guys can me help me out.

*UPDATE*
I used this code to create a random sample data set for the active companies and then merge it with the inactive one. Their is just no pairing what so ever. I just need ONE active for ONE inactive.:

proc surveyselect data=AltmanV2.Donnee_Avant_F_Sante
					out=StratifiedSRS
					sampsize=1643
					method=srs
					outall;
		strata COSTAT;
run;

data Strat;
set StratifiedSRS;
if Selected=1 then output;
else delete;
run;

data test;
set Strat AltmanV2.Donnee_Avant_F;
SIC=INT(input(SIC,4.)/100);
run;

proc sort data= test;
by Fyear SIC;
run;

Re: Case-control Matching with Multiple data sets

tomrvincent — Thu, 14 Mar 2019 15:20:02 GMT

use this to pick a random integer:
%macro RandBetween(min, max);
(&min + floor((1+&max-&min)*rand("uniform")))
%mend;

add a record number (_n_) to your dataset and pick a number (%RandBetween(1, 1643 )).

That should help you get your 1 record.

Re: Case-control Matching with Multiple data sets

Pabster — Thu, 14 Mar 2019 16:27:21 GMT

Where i am suppose to use it?

Re: Case-control Matching with Multiple data sets

tomrvincent — Thu, 14 Mar 2019 17:23:11 GMT

It works in either a data statement or proc sql.

Re: Case-control Matching with Multiple data sets

andreas_lds — Thu, 14 Mar 2019 21:29:04 GMT

With 9.4m4 or later the you can use the function rand: z = rand("integer", min, max);

Re: Case-control Matching with Multiple data sets

Pabster — Mon, 18 Mar 2019 15:28:51 GMT

I integrated the code to the Active company data set like this:

data Random;
set SicMatch;
%macro RandBetween(min, max);
(&min + floor((1+&max-&min)*rand("uniform")))
%mend;
Choice=%RandBetween(1,3154);
run;

and then merged it with the Inactive dataset by choosing only numbers between 1 and 1647 ( so one per intactive company).

here is the result

But it still doesn`t quite give me this format:

DATADATE FYEAR DLRSN CONM DLDTE COSTAT SICH

03/12/1992 1989 . A 0 112

03/12/1993 1989 02 B 1990 1 112

03/12/1994 1990 . D 0 333

03/12/1992 1990 03 F 1992 1 333

03/12/1993 1994 . J 0 445

03/12/1994 1994 03 L 1996 1 445

03/12/1998 1998 . I 0 001

03/12/1998 1998 02 Z 2000 1 001

any clue on how I can arrange my data to obtain this format?