需要病例对照研究，group=1为病例，group=0为对照。
要求：病例、对照1:4；
male+/-0,birth year+/-2, age+/-5
wts为5 2 1

前后两种方法都试过了，前面那种方法在LOG里又重复了一遍程序
后面的那个test，

data fakereg;setfakereg; timex=5; if case=0 then timex=6;

%gmatch(data=fakereg,group=case,id=id,

mvars=age sex,wts=2 1,dmaxk= 5 0,transf=0,

time=timex, dist=1,ncontls=2,seedca=234098,seedco=0489,

out=regccout,outnmco=matched,print=Y);

run;
结果是：
WARNING: Apparent symbolic reference NCO not resolved.
WARNING: Apparent symbolic reference NCA not resolved.
WARNING: Apparent symbolic reference NCA not resolved.
ERROR: A character operand was found in the %EVAL function or %IF condition where a numeric operand is required. The
condition was: &NCA*2
ERROR: A character operand was found in the %EVAL function or %IF condition where a numeric operand is required. The
condition was: &NCO < %EVAL(&NCA*&NCONTLS)
ERROR: The macro GREEDY will stop executing.
1603 run;


因为字数超标，贴上原地址
https://bbs.pinggu.org/thread-1091720-1-1.html