擅长:python、mysql、java
<p>方框表示第一和第三个四分位数,红线表示中间值(第二个四分位数)。<a href="http://matplotlib.org/api/pyplot_api.html#matplotlib.pyplot.boxplot" rel="noreferrer">documentation</a>给出了1.5 IQR下的默认晶须:</p>
<pre><code>boxplot(x, notch=False, sym='+', vert=True, whis=1.5,
positions=None, widths=None, patch_artist=False,
bootstrap=None, usermedians=None, conf_intervals=None)
</code></pre>
<p>以及</p>
<blockquote>
<p>whis : [ default 1.5 ]</p>
<p>Defines the length of the whiskers as a function of the inner quartile range. They extend to the most extreme data point within ( whis*(75%-25%) ) data range.</p>
</blockquote>
<p>如果您对不同的方框图表示法感到困惑,请尝试读取<a href="http://en.wikipedia.org/wiki/Box_plot" rel="noreferrer">the description in wikipedia</a>。</p>