如何得到交叉表的横向加权平均数??? 格式如下?
数据项有
| typename | total |
_________|____________________|________________________________|
areaname | num1 | num2 |num3 | sum_num1 | sum_num2 | sum_num3|
_________|_______|______|_____|__________|___________|_________|
| | | | | | |
| | | | | | |
| | | | | | |
| | | | | | |
| | | | | | |
sum_num1 就是num1的横向汇总就行了
sum_num2 是个加权平均数 num2 * num1/(所有 num2 不为0的 num1 的和)
sum_num3 同sum_num2