695  proc logistic data=zhenglih descending;
696  where group=2;
697  class a06(ref="1") b07(ref="4") d00b(ref="0") b08(ref="1");
698  model t03=a06 age1 time1 b02 b06  b07 b08 c08a1 d00a d00b d01 d04b d05b
699            d07b d08b d10b e01 g00 g01 e02b h01  i01 L;
700  run;

ERROR: Invalid reference value for B07.
NOTE: 由于出错，SAS 系统停止处理该步。
NOTE: 从数据集 ZHENGLIH. 读取了 556 个观测
      WHERE group=2;
NOTE: “PROCEDURE LOGISTIC”所用时间（总处理时间）:
      实际时间          0.01 秒
      CPU 时间          0.01 秒



701  proc logistic data=zhenglih descending;
702  where group=3;
703  class a06(ref="1") b07(ref="4") d00b(ref="0") b08(ref="1") ;
704  model t03=a06 age1 time1 b02 b06  b07 b08 c08a1 d00a d00b d01 d04b d05b
705            d07b d08b d10b e01 g00  g01 e02b h01  i01  L;
706  run;

NOTE: PROC LOGISTIC is modeling the probability that T03='1'.
WARNING: There is possibly a quasi-complete separation of data points. The maximum likelihood estimate may not exist.
WARNING: The LOGISTIC procedure continues in spite of the above warning. Results shown are based on the last maximum
         likelihood iteration. Validity of the model fit is questionable.
NOTE: 从数据集ZHENGLIH. 读取了 113 个观测
      WHERE group=3;
NOTE: “PROCEDURE LOGISTIC”所用时间（总处理时间）:
      实际时间          0.30 秒
      CPU 时间          0.39 秒

-----------------------------------------------------------------------
proc logistic data=zhenglih descending;
where group=2;
class a06(ref="1") b07(ref="4") d00b(ref="0") b08(ref="1");
model t03=a06 age1 time1 b02 b06  b07 b08 c08a1 d00a d00b d01 d04b d05b  
          d07b d08b d10b e01 g00 g01 e02b h01  i01 L;
run;
proc logistic data=zhenglih descending;
where group=3;
class a06(ref="1") b07(ref="4") d00b(ref="0") b08(ref="1") ;
model t03=a06 age1 time1 b02 b06  b07 b08 c08a1 d00a d00b d01 d04b d05b  
          d07b d08b d10b e01 g00  g01 e02b h01  i01  L;
run;