项目管理 公式

| name | formula | cn | | ------------------------ | --------------- | -------- | -------------------------------- | | Standard Devision | = (P-O)/6 | 标准差 | | TF/Total Float | = LS-ES = LF-EF | 总时差 | | Comm Channels | = N(N-1)/2 | 沟通渠道 | N=项目成员 | | Benefit Cost Ratio | =Cost / Benefit | | < 1 不好、拒绝
> 1 越高越好 | | Net Present Value | =FV/(1+r)^n | 净现值 | | Future Value | =PV(1+i)^n | | ROI/Return of investment | |

标准差

$$SD^2 = \frac{\sum^N_{i=1}{(x_i - \mu)^2}}{N}$$ $$SD = \sqrt \frac{\sum^N_{i=1}{(x_i - \mu)^2}}{N}$$

• $\mu$ 为平均值 $(\overline{x})$

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• wikipedia 标准差Wikipedia标准差