擅长:python、mysql、java
<p>不要对缺少的值使用<code>"NA"</code>:它是一个字符串,会导致其他值也被解释为一个字符串。相反,将行改为</p>
<pre><code>import numpy as np
data_luruh['y_i'][0] = np.nan
data_luruh['g'][0] = np.nan
</code></pre>
<p>给予</p>
<p><a href="https://i.stack.imgur.com/4i2nQ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/4i2nQ.png" alt="graph with negative slope"/></a></p>