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→有效信息EI
===有效信息EI===
===有效信息EI===
如果只存在观测噪声，<math>L=1
</math>，<math>\epsilon\ll 1
</math>，有效信息EI为：
<math>EI \approx \ln(\frac{L}{\sqrt{2\pi e}})+\frac{1}{2L}\int_{-L/2}^{L/2}\ln \left(\frac{f'(x)}{\epsilon}\right)^2dx.
<math>EI \approx \ln(\frac{L}{\sqrt{2\pi e}})+\frac{1}{2L}\int_{-L/2}^{L/2}\ln \left(\frac{f'(x)}{\epsilon}\right)^2dx.
</math>
</math>
</math>，EI变为：
</math>，EI变为：
<math>EI\approx -\frac{1}{2}\int_{-1/2}^{1/2}\ln\left[\left(\frac{\epsilon}{f'(x)}\right)^2+\delta^2\right]dx.
</math>
==基本条件==
==基本条件==