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- UID
- 223454
- 帖子
- 341
- 主题
- 12
- 注册时间
- 2011-7-11
- 最后登录
- 2014-8-7
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| obviously it cant be negative. But mathematically i looked at the equation and started thinking if the third part of the equation was negative enough, it could lead to a negative result. Was just trying to see if it was possible in the equation. I am fully aware that negative std dev wouldnt make sense. |
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发表于 2011-7-26 11:51
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