DATA cited;
INFILE CARDS;
INPUT CITED_ID KW_1 $ KW_2 $ KW_3 $;
CARDS;
1000 xx1 xx2 xx3
1001 aa1 aa2 aa3
;
run;
DATA citing;
INFILE CARDS truncover;
INPUT CITED_ID CITING_ID KW_1 $ KW_2 $ KW_3 $;
CARDS;
1000 2000 xx1 xx2
1000 2001 yy1 xx2 yy2
1000 2002 xx3 yy1 yy2
1000 2003 yy2 xx2 zz1
1001 2004 aa1 aa2 xx1
1001 2005 aa1 bb1 bb2
1001 2006 aa1 bb2 cc1
;
run;
proc transpose data=cited out=key(where=(col1 is not missing));
by cited_id;
var kw_:;
run;
data want;
if _n_=1 then do;
if 0 then set key;
declare hash h(dataset:'key');
h.definekey('cited_id','col1');
h.definedone();
end;
set citing;
array x{*} kw_: ;
tot_new_kw=0;
do i=1 to dim(x);
if not missing(x{i}) then do;
col1=x{i};
if h.check() ne 0 then do;
tot_new_kw+1;h.add();
end;
end;
end;
new_kw=(tot_new_kw ne 0);
drop _name_ i col1;
run;
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