Matter needing attention of geometric mean

Matter needing attention of geometric mean:
1. Usally, it is used in 等级资料或对数分布资料;
2. If there is Zone in your data group, usally, you can not use plumply it.
3.investigative data can appear synchronously negative values and plus values; If all values are negative, you may change them to plus values, then add negative symbol in font of the result after you got a result.
适用条件1.成倍数关系的资料。2.明显正偏态分布的资料
attend:
对数技巧的使用对实际计算是必不会少的.
列成频数表时计算公式如下：
LogG=∑flogX/Σf