Statistics SAS程序频率风险比
我试图使用PROC FREQ计算风险比和相关置信限。这通常很好,但在两个实验臂的所有测试单元都经历事件的情况下,风险比不计算,而应该是一个 考虑以下几点:Statistics SAS程序频率风险比,statistics,sas,Statistics,Sas,我试图使用PROC FREQ计算风险比和相关置信限。这通常很好,但在两个实验臂的所有测试单元都经历事件的情况下,风险比不计算,而应该是一个 考虑以下几点: Treated event: 2 Treated no event: 0 Not-treated event: 2 Not-Treated no event: 0 Risk ratio = 2/(2+0) / 2/(2+0) = 2/2 = 1 然而,PROC FREQ返回注意:grp by ACCOU
Treated event: 2
Treated no event: 0
Not-treated event: 2
Not-Treated no event: 0
Risk ratio = 2/(2+0) / 2/(2+0)
= 2/2
= 1
然而,PROC FREQ返回注意:grp by ACCOUNT表的行或列总和为零。此表未计算任何统计信息
我使用了零选项,但这并不能解决问题
DATA temp;
grp = 1;
occur = 0;
count = 2;
OUTPUT;
occur = 1;
count = 0;
OUTPUT;
occur = 0;
grp = 2;
count = 2;
OUTPUT;
occur = 1;
count = 0;
OUTPUT;
RUN;
PROC FREQ DATA = temp ORDER = internal NOPRINT ;
WEIGHT count /zeros;
TABLES grp*occur / RELRISK ;
OUTPUT OUT = odds RELRISK ;
RUN;
你说这个事件无处不在,但在数据中却没有发生(零次)