分组数据如下：
1组 男性 104
1组 女性 73
2组 男性 269
2组 女性 162
3组 男性 169
3组 女性 68
我把数据按以下输入spss
1 1 269
1 2 162
2 1 169
2 2 68
3 1 104
3 2 73
结果spss提示警告：
>Warning # 3211
>On at least one case, the value of the weight variable was zero, negative,
>or missing. Such cases are invisible to statistical procedures and graphs
>which need positively weighted cases, but remain on the file and are
>processed by non-statistical facilities such as LIST and SAVE.
不知何意？请指教！